I'm guessing Apple couldn't really go nab engineers or use designs from the Chinese brands that also have done folding screens for a while. And I'm guessing Samsung wouldn't want to give them without eating too much into Apple's margins.

That's a lot of assumptions on my part though, and you know how that goes.

It's still the first time Apple had a go at it and its design is obviously flawed, otherwise it wouldn't be failing so quickly.