What is classic fantasy and why it affects us in way it does is eternal debate, which would lead to Tolkien and what is Tolkien and so on.
But if you want to see what was lost in transition seek no further than Larian's own franchise, Divinity. Just compare the look and feel of Divinity 1 to newest ones and you will see.
In a world where you start from nautiloid burned by 3 dragons as vampire or exploding wizard there is no place for peasants and soldiers, no place for childhood rogue friends with 1 gp daggers, or +2 swords or defeating kobolds giving any satisfaction. And there is no place for you.
You are soo wrong.
you have no idea how is important that wotc allowed spelljammers in BG3.
All the old D&D fans want wotc to bring back spelljammer and planescape, and BG3 is the perfect troyan horse.
Speaking of BG1 start: the bad guy in the intro is an over the top edgy fighter with a high fantasy armor AND GLOWING EYES.
You start in candlekeep, the center of knowledge of the entire planet.
The most guarded and protected library: in the last tabletop incarnation if you try to enter candlekeep with no permission 1 archmage and 4 mages appear and if they need help they call 4 more archmages for support.
and of course you also meet Elminster the first day of travel!!
So no BG was not about paesant and soldiers.
BG was about being protected by harpist and the chosen of mystra in a magical fortress.
Only people that don’t know the forgotten realms think the start of BG was “simple and humble”