Here is Captain Chris Myers explaining the pros and cons of baitcasting versus spinning tackle. He has a whole series on it. Well worth watching. Spinning Tackle
Now, he has specific reasons and prejudices: he fishes primarily in the flats in Florida. Still, valuable advice for those of us fishing lakes and rivers.
Agreed that a guy can use a baitcaster for many of the finesse applications; but, it will be less effective . . . just as using a finesse rig really struggles with power fishing applications.
How do I know? We are capitalists, still I think, and the guys earning paychecks, almost to a man, use finesse equipment for finesse rigs. If not, they'd just use baitcasters.
The primary thing that comes to mind for me is the rig weights. Baitcasters are going to struggle with really light lures and plastics. Sometimes you have to go really finesse to catch them.