sure but in some of the cases we were scaling products to millions of users. And it would work great but don't expect engineers to create good UI/UX paying attention to the "small" details. That won't happen naturally.

Maybe hire some UX-focussed engineers then?

I can't help thinking that the "fungible engineer" concept has done a lot of harm to tech hiring and team structure - of course if you take a guy who most is excited about database optimisation and put him on UI work he won't be passionate about it.