Really, righ now artists and GA's are not mach use exept if one going for culture victory.
It is very hurd to push borders culturally.
Artist specialists produce 4 culture + 1 research.

I wander about logic of that.

Culture is not mach use in most cases, except for border push or culture victory. Why not improve artist and make castle system a bit more attractive?

Change them to +6 culture only + 1 happy. Sort of like old entertainers, but with culture.

One more way to regulate city happiness.

Settled GA can provide +1 happy to.

That increase there power for border push and as economical regulator.