Right now it often tells you that you have advantage or disadvantage, but not the source of it, and it's rather unhelpful at times.
But it does...#
![[Linked Image from i.imgur.com]](https://i.imgur.com/aVtvAK5.jpg)
BUT!
If your "target percentage tooltip" tells you: (numbers are only example, take them with reserve)
Weapon proficiency - X - 10%
Target in range - X - 10%
Target visible (in terms of light) - X - 10%
You clearly see that if you switch your weapon for some your character is proficient with, you take another few steppes closer, and you somehow deliver light source to your target ... you sudently raise your hit chance from 60% to 90%.
As far as I understand, the tooltip above only shows sources of advantage and disadvantage with green/red part showing how much is gained and lost. In the example above the character has both advantage and disadvantage resulting in neutral roll without either. Tis true, that the game hides, however, other modifiers.
Combat log is unfortunately clunky to use, and limited in its functionality at the moment. BG3 being such a high budget production, I think it would be in Larian best interest not to force players to dive into a dull combat log for necessary information. I think that is what they are going through with this XCOM-like interpretation of combat rolls but I don't think they are going about it a right way.
It's a bit different then what OP requests, but I would rather they approached combat rolls the same way they do skill checks - don't show percentage to hit, but show number we have to roll, and list positive and negative modifiers that will be applied. Current percentage is just a confusing middleman between the player and actual mechanics.