BG3 is a much bigger game and for the project to be successful they have to sell many more copies, which means they have to make a game that is accessible to as many people as possible.
BioWare members began to talk up the game themselves, providing updates and answering questions on Usenet and message boards devoted to D&D. By the time the game came out, BioWare’s infectious, patient, and transparent posts had built up anticipation in the target market. Greig remembers one of the major trade magazines projecting Baldur’s Gate for 100,000 copies sold. Even internally, BioWare hoped for only 200,000, which would be enough to justify a sequel.
You're right though. Nothing inherently "wrong" with that. At times I'm still astonished that the blockbuster games market from time to time still produces games as uncompromised as Alien:Isolation or Prey (Arkane).