Not sure but it looks like you just want to reach 100% to hit...
About light yes in D&D characters that can't see in the darkness aren't as proficient in the darkness in combats. Weren't you talking about synergies and strategy ?
Heh, no - I do not need 100% to hit, even DoS2 was not 100%. But hit chance of 75% still would mean I will *miss once on each turn* on average with my 4 characters.
So what I would like, I guess, is that
turns where I miss are in minority. That would mean I miss once every 2nd turn or less - otherwise its still 'always miss' annoyance. For that to happen, average chance to hit for each character should be over 91%.
And I like having to use lights, that is about only meaningful synergy so far in BG3, as I mentioned in some of my posts before.