Mikey has been playing BG3 for about 2 days. Mikey sees an arbitrary percent to hit and wants to know how that percentage is calculated, because he wants to increase his chance (like any normal player would want to!)
I think Mickey is unlikely to wonder how he can increate his chance, or even think it is possible. More likely, if he can't power through an encounter through attack rolls he will reach for the multitude of other ways that Larian prepared for one to go through encounter - thunder arrows, granades, push. If all fails, he might google ownbear trick and jump on enemies from high up.
And if he really wants to understand D&D he will ask google. I don't think BG3 is a game that tests your understanding of D&D systems much. The philosophy seems to be that whatever you decide to do, you should have "fun". I woudn't be surprised if a person who doesn't quite understand how things work will enjoy the game more, than someone who does. I know BG1&2 worked that way for me - a lot of magic evaporated, once I realised how shallow that system really was.
