Ironically the curved e-ink is only there to show a wallet label on the side so you can "stack" multiple devices together. I don't understand why anyone would need more than one device?
They don't but somehow, they've managed to master the art of convincing their customer of the need to purchase more than a single device of the same kind
[refer to some of the comments in their subreddit].
- They seem to enjoy taking advantage of their ignorant users (SMH)!We planned to ship Ledger Stax earlier this year, but it has taken our display provider months more than they originally expected to ensure every screen matches our quality standards.
Wait, what?! I didn't know they had any 
Often when v1.0 products come to market, they're really v0.9. This delay with the screen has allowed us to deliver a product in Ledger Stax that is truly beyond v1.0 at launch.
IIRC, there was also a delay with Nano S Plus, but there were still a lot of issues at its launch!