TFS' original work is pretty terrible all around. They made a completely original cartoon at some point before they canceled DBZA - something called 'way of the fist' or some other generic name - and it was just a slog. Unfunny, cliche in the most uninteresting ways, bland art and animation, and extremely generic. Like a boring Jackie Chan Adventures without Jackie or Uncle.
DBZA was extremely high quality to the point that you can see how much everyone involved was truly passionate about it....but KaiserNeko was absolutely their bottleneck:
- Kaiser refused to let anyone even so much as help him edit, causing almost all of the massive schedule slips they suffered from
- At one point he pushed himself so hard he had a miniature breakdown and had to take a hiatus for his health, holding up everyone because their one editor was out of commission
- He was an utter sub simp and constantly fought with the rest of the cast who were either neutral or positive toward the dub. He always fought with the others over how to pronounce Goku, and is the reason MasakoX went with such a shrill voice for Goku
- I believe it's also implied he's the reason Krillin ended up with the whiny puppy voice when Lanipator demonstrated he could do a dead-on Sonny Strait copy if he wanted to
- He absolutely despised the Faulconer score and only started relenting after Ainztunes joined up in the Cell saga and started making hybrid songs that combined the Japanese track with Bruce's.
- He shipped Dende/Gohan and had big plans to have Dende get sassy and catty with Videl in Buu saga
The other thing that held them back was Takahata101, who would blow out his voice sometimes and because he insisted on playing every bombastic and memeable character that often held up everyone else. In particular they apparently had some fights over who would voice Cell. I believe it was down to Kaiser and Takahata in the end, but Kaiser still ended up doing a bunch of Cell's lines for editing purposes when Takahata would injure himself or get sick.
People kept suggesting that Kaiser hire someone - anyone - to help him edit, but despite the fact that other members of TFS were fully capable of editing and that they were literally making $12,000~ a month from Patreon at their height (plus their merch) Kaiser insisted no one could understand his notes or thought processes but him and it would just be impossible to collaborate. They also claimed that none of the money from Patreon would ever go to the production of DBZA, and so no matter how high the numbers got, Patrons were never to infer that meant DBZA would be released any faster. Instead, they just moved into a giant studio and got a bunch of paid employees for their let's plays and eventually one episode of an underwhelming cartoon.
Incidentally, they originally planned to have Markiplier voice either Hercule or Buu because he'd auditioned for a part in the Trunks movie but that fell through re: Hercule, and then they quit before Buu. Although they blame burnout, if I recall correctly I think Kaiser always hated the Buu saga - it was a different member's favorite, but I forget who at this point, probably Lanipator since he loves the concept of fusion. I get the feeling it was less about true burnout, and more that Kaiser was tired and couldn't be bothered to go through with the work of doing a saga he hated.
They had a special tier on Patreon that was $25 during November and December where they would send out Christmas cards for that particular tier, but on the second year they had it, they never bothered to actually send out those cards. They also used to have private Twitch editing streams every month for Patreons, but they had to eventually stop doing that because Kaiser was doing so little editing that there was nothing to show.
I actually think that the quality of the show continuously went up over time as their skill increased, but the trade-off was that they slowed down to completely unacceptable levels that they always made excuses and deflections over whenever someone would complain about it. Mostly Kaiser, as he would read early comments and pick fights with anyone who said negative things (he continues to do this even at his own subreddit). They actually did a lot of things that the casual DBZA viewer simply never appreciated, such as completely redrawing frames and fixing art/coloring/animation mistakes alongside their eventual ''fully original animation' stuff they started adding later on....but that really just hammers all the more why Kaiser was insane for trying to do it all on his own. According to his own testimony as late as the Cell saga he was still literally even doing the audio leveling for the different lines that TFS would record and send to him. Despite the fact that both Taka and Lani could have done that kind of thing, Kaiser was a total control freak who also did all the directing for the voice acting and chose the takes they used.
I'd argue that it's not even TFS burnout, it's just Kaiser burnout. The annual 'Toei lit our channel on fire, save us Funimation!' fiasco probably didn't help either, but considering how little time anyone else put into DBZA and the fact that all of their 'real work' opportunities came from their DBZA fame (including when Funimation let them write custom dialog for the characters they voiced in Xenoverse 1 and 2), and all the other examples of Kaiser swinging his dick around and demanding his way, I wouldn't be surprised if he all but unilaterally pulled the plug.