I think you can solve many of the mentioned problems by giving rules for the AI, for example avoiding superhuman feats, and defining personalities. It's also not a general Goggle AI search what would happen if a request and decision were to be made, it should be a specially trained AI. It may be that we are not all able to see the latest advances in this area which is evolving quickly. And bad examples of the past should not necessarily define the field for ever.
The argument about NPC control and TB experience is an interesting one. In BG 3 you can play 4 different classes which can enhance your game greatly because of the diversity. AI control would take that away. Although I also read several complains over the years from people who did not want to play more than one character, so an optional AI control may be advantageous especially for TB. Where we are used to waiting.
