You should have used a good bonding sealing primer on the walls before painting. I wouldnt worry about the ones you didnt. Just be thankful, you didnt mess up both bathrooms. I might be tempted though, to wait a week, and put a coat of bonding sealing primer on it too, and then repaint it once the primer is dry.

Thanks for your feedback. I assume that the areas that lifted (while rolling) could be a direct result of not having used a standalone primer?

There are a few parts of the already painted walls that need a very light once over. I plan to do those areas gently with a brush.

Wait for the skim coat to be good and dry, then prime with Zinsser Gardz. It is clear and you may wonder why you bothered when you don't see any difference after applying it, but it is the best sealing primer and will keep all the flashing and burnish marks from appearing. Apply over everything,

Photo from a painter on Paint Talk showing 2 walls - top with one coat of paint only

bottom 1 coat of paint over gardz.

I've seen recommendations even for smaller drywall repairs that the best result is to use a primer before touch up paint on the repair.

My sister decided to paint some of her ceiling in her home before putting it up for sale. The ceiling is popcorn, but at least a lighter coat of popcorn. She went to the paint store and asked for recommendations on how to paint, what to use. She was afraid that in the process of painting she would get spots that the popcorn comes off and end up with a mess. It was recommended to use a oil based primer. The reason for that is the acrylic is water based and the moisture from acrylic would be absorbed by the popcorn and loosen it. The oil based would not be absorbed but would coat. I've heard good things about Kiltz primer but don't personally know.

With all the work you had done I would pay the extra money and go to a paint store (like Sherwin Williams or other) and get recommendations from a place more knowledgeable.

Oh, and by the way, you do not need to use a brush. Sheetrock mud that was used to skim and texture, is water based. Latex type paints will disolve the finish, as you found out. Thats why any new sheetrock, or any repairs to your existing sheetrock, should have a primer sealer on them, before you paint. I do prefer that primer to be oil based. Gardz mentioned above is a good primer. Be aware, that there are different kinds of primer, and some of them are latex, and will also disolve the newly applied texture. If you have any popcorn ceilings, that havent previously been painted, they also need a good coat of a sealing bonding primer, and again, I prefer oil based. You can use a roller, once its all primed correctly.

Thanks, so we've got the bathrooms pretty much all painted at this point. Whatever unpainted area there was yesterday, I applied some PVA primer to before paint.

Overall, it looks pretty good.

Do you still think I'll be fine (albeit lucky) now that I've got paint applied the walls?

Also, say we come back in 2 years and decide to change the color, anything special that I should do before hand, or would a roller likely be safe to use by that point, with minimal chance of pulling up the skimcoat like I was experiencing initially?

This has all been a valuable learning experience for me. And I again thank you for your input. My hope is that what is up currently will be ok, and that we don't have to do this all over again 😔. Money is one thing, but the disruption of everyday life by having bathrooms all gutted was the worst of it. (Bathrooms are very small, 8'x5')

You will know soon enough. Bathrooms have a bit of humidity. If walls bubble, or peel, etc, then you will know.