"Developer experience matters" and "Vercel" being the example is something I never thought I would see together.

I actually do agree that Vercel's admin screens are quite good compared to the other usual suspects. But I don't consider that to be on the development side of things. It's done decently well because it is geared towards the business folks who are paying the bills.

Developers writing code on top of the development solutions produced by Vercel have been completely forsaken.