1. My primary point was regarding uniqueness. It's a unique design, for sure.
2. "is pretty fragile" isn't really something I think about for my phones; It's not like I'm throwing them across the room or such - It doesn't have to be a tank, just survive daily use (it does). The only real "fragility" thing that crosses my mind is that I avoid leaving it open when I sit it down and walk away from it... but I think about similar stuff with any phone. I don't leave a regular phone sitting unattended on the couch, where it could be sat on for example. All of that said ... The folding devices are more durable than you'd think.
3. The price is a bit of a point of frustration for some, sure. But for anyone who can afford it, it's rather moot in the context of uniqueness/usability.

As someone who has had a Galaxy Z Fold 4 for about 14 months, it has no scratches or blemishes on either screen - inner or outer. It's definitely at the point of usability, and I can't see myself being comfortable going back to a normal phone at this point.