My reason for switching from a M1 MacBook to a ThinkPad: I can install Linux without worrying about compatibility issues. Also, being able to have 64GB RAM, 1TB SSD without having to sell a kidney to afford it is nice.
Taking a cursory look at the ThinkPad website, which is nearly unnavigable, the model I was able to find with 64gb of ram and a 1TB currently costs (a lot) more than an M5 Pro that has a better SoC, way better screen, way better battery life probably, it's not even a contest now other vendors had to adapt to hardware shortage pricing.