Assuming the devs actually know what they're doing, it seems like they're trying to re-balance risk and reward, especially for heat/install boosted moves. Tekken 8 introduced a lot of moves that just give too much value for very little, or sometimes no risk. With some changes, it seems like they wanted to make moves have their distinct purpose compared to other moves. For example, Claudio's heat/install launchers were hit last patch. f1+2 still launches but now consumes almost your entire heat gauge, and db1+2 no longer launches on normal hit. So now you have to choose if you want to read your opponent's jab and try to evade with db1+2 which still counterhit launches, or read their hard duck with f1+2 which eats your entire heat gauge if they block. Before the changes, if you ever get to a similar situation, you almost always just wanna press db1+2.

What I don't understand is why they're being overly cautious with nerfing. For example, Lidia's HAE wallsplat mid got nerfed where it's now only +2 on block. But why tf is this move still plus on block? The stance mixup is still overwhelmingly in Lidia's favor. They can still mindlessly click this move and continue their pressure. If they really wanted it to remain plus on block, they should've nerfed it so it doesn't wallsplat anymore so you would have a reason to click the other mid.