I kinda like the rough finish also they feel smooth, the problem is because FDM printing is layered from the bottom, so you cannot get the same shapes as in injection molding (which has several other different limitations)
As an example:
If I want a smooth curved top part, I cannot have the protruding tip below.
But I think I found a solution already, after a few hundred quick tests.
Yes, smoothing with acetone is mostly for the “looks” not for precision. Also is not that effective in PLA.