What do y'all recommend using for embedded products and appliances instead of Raspberry Pis?

The Pi (and the CM in particular) has become a popular base system to build products like touchscreen appliances, control panels, etc. on, because it is (or at least used to be) cheaper than traditional industrial controllers and NUCs. Also Pis can be sourced reliably and in large numbers (probably even decades into the future).

I'm not looking for the usual "buy a used laptop/phone/NUC" recommendation. That stuff makes sense for hobby projects, but it's obviously too janky to build products around.

So what would y'all use? I'm looking for something that supports Linux, is reasonably priced, and available in large volume long-term.