Shot blocking being too strong in combination of 3-2 zone could have been solved rather easy by just finding way how to make shot blocking on jump shots less effective & "bigs" breaking 3-2 zone with ability to shoot easier than in past.
If you want realism, having modern basketball would mean that centers and especially every PF can shoot 32-38% for 3 on high volumen. Against modern 3-2 zone, teams just switch to 4-1 offense and by default one of bigs gets wide open, or elite passers break zone with interior pass through zone.
Lot of us, who are in mist of expensive rebuilds ( hall of fame potential players, paid real money at age of 18-19, + expensive max head coaches + seasons spent in training ) are now feeling screwed over with new patch because we selected and trained players based on old tactics, and now training is:
1) harder due progressive fatigue
2) slower, due changes
3) selecting players based on skills that now have different cost levels leaves us in really bad spot
Overall, if you want more realism, your actual aim should have been to find ways how to make OD & SB less effective, to not have 68-78 games, and more of actual basketball games, with +100 points scored every game.
Also it's hard to talk about realism when you have so many players out there with +165 skill level. Basically every A tear team has his own version of Lebron.
Also main reason why so many teams in meta had shotblockers comes from sheer fact that having well balanced PF/C with inside scoring AND inside defense being 20 or higher costed too much. It's your salary calculation that caused high end role players ( like 20 SB, 20 ID, 2 jumpshot , 8 inside shot ) not other way around.
Also in personal experience, "all around Cs" neither were good at defense nor offense, but costed crazy money. That's why nobody wanted to us them.
Needless to say, you have issue with "elite passing" that costs crazy money, yet has almost ne practical effect in game. Hence, as we talk, there are only 13 players on market that have passing over 16, and all of them are either centers or terrible players. That's yet another way how you could have solved low scoring & super unrealistic impact of OD & SB. By simply making passing offset them. But no.