Just like any other thing, there are enjoyable current isekai titles (to one's liking) if you search well enough.
Here are the modern isekai I enjoy:
Peak modern isekai. More Brave series is never a bad thing, even if it's just a fanfiction. I like that the author came up with new Braves instead of reusing already existing ones. I'd watch this if it was a full-length anime entry in the Brave series.
Espimon is really cute, and the villains' plan
to merge the Digiworld and the real world based on the fact that subatomic strings, the basis of all matter in the real world, come in open and closed forms similar to the 0s and 1s that make up the Digiworld is exactly my cup of tea! Also, the main kid character is a Fortnite kid. What has this world come to?
As for retro isekai, I recommend Future Police Urashiman (isekai into a futuristic, highly technological world), Aura Battler Dunbine (as well as Wings of Rean and the Garzey's Wing novels -- the original fantasy mecha isekai), Kurogane Communication (good short series to watch if you're busy that has cool robots and ships), and Dual Parallel Trouble Adventure (happy Evangelion and also a Tenchi Muyo spinoff just because).
I finished watching Brain Powerd, and I have to say, it really wasn't that bad. It was pretty good, in fact. Yes, there were moments of unintentional comedy (a long drawn out word in the English dub as well as when Jonathan and the Baron enter Orphan after it was claimed by the US), but I still unironically enjoyed it and do think, as Tomino said, that it is better than Evangelion. Brain Powerd just requires you to watch with your full, undivided attention and have a conversation with it, which makes it more interesting to me. The characters were likeable and easy to sympathize with. Yuu was a likeable main character, and Jonathan had plenty of sympathetic moments. The mystery of the mechs and Orphan slowly being revealed was cool as well. I thought the mechs being alive, but like horses or dogs instead of basically overpowered humans (like Transformers) or horrifying sentient monsters (like Ideon) was really interesting and unique. As for the designs, there was an interesting contrast between human-built machines (the square, angular shapes of the planes, helicopters, and Novis Noah) and the organic creatures (the more flowing, rounded designs of the Brains, Grand Chers, and Orphan). As for people saying Brain Powerd is a bad Evangelion ripoff, it honestly seemed to be closer to a standard Tomino anime than an Evangelion ripoff -- Betterman felt like more of an Evangelion ripoff than Brain Powerd. I can understand why people don't like Brain Powerd, though -- between its dense, terminology-laden dialogue, more complicated presentation, and overall lack of fanservice (save for the intro, which you can skip), it doesn't really provide what most anime fans like. I'd only recommend it to people who are familiar with Tomino's other anime, hardcore mecha fans, people in the mood for something more complex, and people looking for anime with little/no fanservice. I can't wait to read the manga for this show!
Here's a nice little show about transforming train mecha. If you wanted to watch Shinkalion but minus the choppy CGI, this show is for you. Yes, it's unsubbed, but it's a short, episodic kids' anime, so it shouldn't be hard to follow regardless. Each episode is also short, so if you're busy this is a good one to watch.
