In my opinion, BG III shouldn't be trying to copy the limitations of a PC game made in 1998 that was then designed to try and simulate another game designed to be played with pen and paper and people's imaginations. That is an idiotic idea.
BG III needs to stretch what is possible in 2020 with today's computer tech. It ought to foremostly attempt to bring the creativity, sense of awe, excitement and RPG elements of the truly imaginative strengths of D&D to the computer.
One can do this today much better than one could in 1998. The computer can now simulate things that were abstracted greatly in 1998, and it also does not need the abstraction found in D&D to portray real world physics that only happen "in your head" using very abstract simplified rules found in pen and paper.
Larian was chosen for this game because of their skills at portraying exciting, turn based combat that features a tactical, thinking approach and the use of strategy in a fantasy setting. They are quite good at this. Their earlier game has spells and physical combat, under a different ruleset than D&D. Upon moving to Baldur's Gate, they have changed to D&D's use of the game's races, classes, spells, and combat rules, as well the D&D setting.
Still trying to make sense of this. How exactly BG3 apply modern technology to the game apart from cosmetics?
In fact, it has fairly obselete mechanics and I would even say BG2 had more complex mechanics.
Agreed. The chaining mechanic is obsolete. With BG2EE my characters move where I want them to when I want them to. My toons do block the enemy but they don't block other party members. When I want to separate a character, I simply click and move them and when I want the party to move as a group I just click a single button. If I want to move two or three I use and shift and click. No tiresome: unchain-unchain-unchain / chain-chain/ move / unchain / select / chain, chain, chain. The amount of micromanaging you need to get your party to move is irritating and 20 year old game does party control sooo much better.