The first obvious ingredients are:
- D&D rules
- the Forgotten Realms
- a story which has a relation with the previous BG if not why the 3?
Fine. But the inclusion of the second can satisfy the third to a certain degree.
In the useful ingredients to strengthen the identity of BG, I would put:
- rtwp fights (much more dynamic and demanding than TB)
- 6 characters
- numerous references to the previous saga
The third is the stongest of the three, the second very unnecessary, and the first one ...well, sure more like the originals, but less like D&D, as has been discussed elsewhere.
In the ingredients that have nothing to do in the BG franchise:
- a universe and a gameplay too marked by another license (big problem of identity!)
Agreed. Good thing none of that will apply with BG3, since it is based on the universe, gameplay and license of D&D
- a story that has absolutely nothing in common with previous games
Agreed (but redundant). Again, though, it can be connected simply for being in the same environment (an environment shaped by the events of the first stories)
- half-respected D&D rules (with ignored, neglected and other invented rules)
Agreed, but it's tough to define. The whole 'house rules' thing leaves a lot of room for variety.
- designers and developers who have neither a real desire to respect the BG franchise nor the talent necessary to succeed in making a quality game, well written and with a BG identity.
Agreed, which is why I am glad that Larian, a team with both the requisite desire, respect, and ability, is making the game.
