There's a screen protector, but that can be replaced -- the screen itself is ultra thin glass with a polymer substrate, it's not near as fragile as people say. Sure, if you try and break it you probably can, but you can do the same on an iPhone.With regard to fragility, or rather, damage. Surely the inside screen is likely to suffer being soft plastic?
I personally have never even seen a scratch on my foldables, but I have on my iPhones, keys and phone in same pocket. It doesn't happen with my flip because when it's closed, the screen is fully protected.