I felt the same but my wife got one over a year back and so far the only issue has been needing to replace the screen protector where it loses adhesion and starts to create a "bubble" towards the center of the device.
Bigger issue for me is that - unfolded - it's a bit harder to protect with bumpers, and my experience with mechanical "clamshell" anything tends towards that part going over time
Even unlocked, it might not be capable of connecting to modern networks. Some of the older phones used bandwidths that the carriers no longer have towers for