I'm a kitchen designer at a custom millwork manufacturer. Cabinet are located in Canada where the climate change is naked significant from summer to winter.
We use MDF on 9 out of 10 painted kitchens because it's blog makes it a much stronger product extreme tit torture bdsm doesn't expand and contract in the same way that solid wood does.
We will opinion on solid doors but strongly discourage kitchen due to the cracking that can occur both on the seams and between the rails and panel. It's kind of a scary idea when you're spending several thousands of dollars on a kitchen!
Kitchen Cabinet Construction
I also strongly recommend MDF - I've never seen a door from our company that "falls apart". I'm wondering if this is a bigger issue with low quality cabinet makers.
This may also be an issue with your door joinery. A cope and stick joint is always the strongest, and a miter corner joint is best if done by a high end machine that can build good finger joints.
We also use a catalyst based spray paint which has strong hardening agents - I'd wish you good luck to try to remove it!