Yep. The ruling says that if the President is acting within the legally and constitutionally defined scope of their duties then they shouldn't have to wonder if they'll later be prosecuted for it.

That seems fine on its face, but the problem people keep raising is that we live in a world where the President is legally empowered to do things that are seriously problematic. That's a very real concern, and it's been a concern at the very least since Bush and 9/11.

So the obvious answer to this ruling is to fix that. The President shouldn't have to wonder if they'll end up prosecuted for doing things that are within the scope of their official duties, so what we need to do is more clearly define and limit those official duties so that the President doesn't have to guess what will be seen as crossing an imaginary line when the administration changes.