I have an M4 MacBook from work and a personal Framework 13. The MacBook certainly feels more solid, but I wouldn't call the Framework flimsy, and it still has a premium feel.

I made the mistake of packing my MacBook (at the time an M1 model), my Framework, and my iPad Pro 12.9 (with keyboard case) in a single laptop bag for a work trip a while back. The Framework got bent around the power button in a way that made the button get jammed; I bought a new input cover for ~$100 and replaced it in five minutes. My iPad's keyboard case now has keys that occasionally get stuck, so I'll probably replace that at some point. My MacBook seemed fine at the time, but it developed an intermittent trackpad button jam that could have been caused by that (or maybe a piece of dust).