Also there is a important condition about how this game will go on: "Playable for everyone"
Yes, one thing that Larian wants (every SH wants beacause it's important to survive in actual videogames market), is to make Baldur's Gate 3 and D&D mechanics in general just more appeal and ideal also for Newbie-Friendly. USe a 20 years-old mechanic with late '90 videogame mechanics is not so newbie-friendly for today standards.
But the irony is that the 20 year old movement mechanic is superior to the one we have now both in terms of functionality and in newbie-friendliness. It's the same mechanic that PoE, Numenera and Solasta use.