That white pine is always going to look terrible. Have the drywall crew come back and Re float that area after the pine is removed.

Hard to critique work that is not complete.

It probably goes without saying that showers are supposed to be installed before drywall. And certainly before paint. Perhaps they were on backorder?

When I replaced shower surrounds like this, I had to trim over the edges because of the design. Anytime you use mud near a shower, you can have issues. That would seem to make sense but it was really driven home when I had to cut an access hole in the ceiling of a 10 ft high bathroom. I patched it in the usual way and it kept eventually cracking. So I had a pro redo it. And it eventually cracked. So now I have trim covering the original cut out so that it looks like an access panel but the trim is just covering the cracks.

Now I am sure that you can do it appropriately but it will never be as stable as wood - or even better - PVC.

Another thing. I had a bargain basement build in zone 3A and they still mandated air barrier behind the shower 12 years ago. Zone 3A is pretty warm and generally things get less strict as you move south but you probably should always have it. There does not appear to be any in your build. No endorsement of this link but it has a pic demonstrating how you should see the air barrier if you can see the top of the shower.

https://thehtrc.com/2014/air-barrier-behind-tub-shower

They should learn how to cover bathtubs while doing work. None of this looks like a professional installation. That tub surround transition at the bathtub corner will be a disaster down the road.

"Hard to critique work that is not complete."

Usually true, but not in this case. This screams hillbilly. Clueless hillbilly. Trailer park clueless no-teeth hillbilly.

All of that should be removed and redone. Including the drywall. None is acceptable.