My take in this (ironic) comment was just "no feature is free", which I don't think should be odd coming from a UX designer!

> the idea is perhaps that users vibe-code their own distinct UX with everything valuable to them

I do find this interesting. I work on a complex business operations and reporting platform and every facility has their own lil quirks. More control in their hands would let them smooth out their workflows while still relying on the foundational work our platform does.