no idea about theoretical or practical power generation ... so just going off on tangents as usual.
it seems like wing chun was developed by its namesake nun mainly for unarmed contests with monks and nuns in training then used in situations (against bandits?) that perhaps ended relatively quickly. the whole deception and speed thing was probably important. sometimes with weapons, sometimes not. probably not wearing any armor, but wearing monks/nuns' light clothes.
it seems like xingyiquan was developed by actual combat, derived from spear techniques used in kill-or-be-killed larger scale "formal" combat situations. any deception was probably at army general level, not spear technique level. there probably was no deception in the "hey we are really fighting" level. power generation had to be enough to work with weapons of a certain weight and I guess some kind of armor?
so maybe just maybe that history informs the techniques and power???? maybe not. it seems pretty common sense-y, though. I'm not criticizing wc. I once saw someone get in a fight in a college bookstore. really stupid crowded thing of fighting for space. one guy kinda pushed this little dude slightly. little dude broke out his little chain punch thing. he "won" the fight by mutual silent consent and nothing else happened, but it didn't particularly do any damage as far as I could see. it certainly looked like he could do something cool.