I have to say, I don't really get this. In 4th, you dress appropriate for the meet and the GM gives you +1 bonus to your dice pool, in 5th you say it raises your limit by 1. In both cases a player action is reflected mechanically. I'm not edition warring, I genuinely don't get what you're getting out of these limits.
In terms of like mechanical purpose, it is to keep things more subdued, to prevent insane dice results from neutralizing something by chance alone, and prevent extremely improbable events from occurring, like shooting through the armour of a HTR goon with a hold-out or a gnome out-punching a troll. This doesn't mean that high dice numbers are nullified, just means that you now reliably hit the cap, but when you really need to push beyond you pre-edge it, so you can find the chink in the armour with the streetline you had on you for emergencies, or your gnome can suddenly find the strength to barrel over that troll, but it will never occur by chance alone. Also it might seem like I am focusing on PCs, in my experience as a GM, it is just as (if not more) relevant to enemies, where in combats I have had a total jobber with a garbage gun roll spectacularly well whereas a PC rolled like shit, it prevents the PC from just eating it then and there, not getting away unscathed, but he lives another day and learns not to underestimate a ganger with a Barrens Special ever again. Generally I find the effect is that you can make better judgements, for both PCs and GMs. Want to have them fight a group of people that are threatening but unlikely to gank the PCs by random chance, give them garbage guns with 4 accuracy, enough to make the PC's day worse but unlikely to kill him outright. But if you want to really make this fight tense, you give em better stuff with better accuracy, where if they do get an insane 8 hits with that Yamaha Raiden where the PC got 1, whelp, bad luck, shouldn't have gotten hit, 19 damage, -2 AP is more than enough to kill a PC out right and probably will. Since accuracy is such a key mechanic for weapons, it also means that weapon damages are all the higher, you don't rely on generating your damage via additional successes, was something I recognized when I looked at my copy of 4A to make sure I wasn't mischaracterizing anything from 4th, damage values and AP are practically anaemic in comparison since the Condition fomulae are the same, it's BECAUSE you are supposed to be generating most damage via extra hits. This also means you can go toe-to-toe with more skilled enemies, since they are unlikely to bury you in dice, and to do damage you just need 1 more than them. If that last part is good or bad, up to you. Sorry if a bit disorganized, this was really stream of thought tbh.