I have yet to try a foldable (currently too expensive for my budget), so this just based on what I've read.
To my my understanding, the crease is always visible in any current products, but it has become less annoying in the latest iterations where people don't notice them.
I'm on a Pixel 9 Pro Fold, it's not completely gone but it definitely becomes "invisible" during use. It's mostly noticeable when the screen is off. Which is good enough IMO, things that fold generally have creases and I don't understand why that's such a deal breaker for some.