Carrara can UV map, it is just bad at it. Needs fixin', from a modeler's standpoint.
It's not all Daz's fault either. Not even really mostly Daz's fault. Only thing is they haven't fixed most of the known problems with it. They decided, for whatever reasons, that other features should take precedence. I'd imagine marketing reasons.
There should be a version release that adds no new features and simply fixes everything that is wrong (or as much as possible). There's quite a few bugs that have been hanging for a long time. Most of them can be worked around; but having a 'work around' does not equal 'fixed'.

Friends don't let friends use booleans.