Yeah the game is all about exploiting the mechanics and using everything at your disposal in every fight. Issue is, the game never told you anything about the mechanics and how to use them most effectively, and it did not show you either. So you are either knowledgeable, have very good intuition or plain lucky that you used the right things at the right time.
For someone with no knowledge of either DoS, 5e D&D and that simply played BG1+2 on normal 20 years ago or when the Enhanced Editions came out, which I assume is the core audience for this game, then you are pretty much screwed and left alone. I fireballed my way through BG2 five times at least, and never made use of protective spells, never backstabbed, never used a bard's chant, never really used a skill in general. I just hacked and slashed and tied fireball to magic missiles. And I used timestop to let three explode at once. I daresay that is the average gamer experience of BG2. I never knew anything about the ruleset then, I just played it for the story and the background.
