Seen from this perspective. Larian may have botchet a good (direct) part 4 here because part 3 set the benchmark so high that a future sequel can't keep up. On the other hand, this confirms the trend towards a new setting, as has already been discussed here.
Baldur's Gate: Planescape or Baldur's Gate: Doors of Sigil, a direct continuation that ignores attempts at replicating the Planescape game and instead uses the IP as a setting for the sequel lol
Would prefer another homage and re-imagining of a classic CRPG with another Planescape game, but if attaching it to Baldur's Gate works, then...