If 5e is anything like low levels in IE then it should be even more impactful. While in BG2 you can power through many encounters by smart use of spells, scrolls, and items, in early BG you are completely at the mercy of the dice - and that gets in your favour with levels/better equipment.
I don’t know with 5th edition solved spellcasters problem - them being fairly useless on low levels and supremely powerful in late ones.
