The screens are pretty fragile, however they’re protected when folded. Just don’t drop them onto anything while open…
Other than that they’re surprisingly robust. I’ve had 2 Moto Razr models and a Samsung Z Fold. First Razr did break the screen by leaving it open in a stupidly precarious position and it hit a piece of metal below directly on the folding screen when it fell. But day to day use I never worried about it.