There are good PMs out there watching in horror as their peers make changes and features that are obviously doomed (to anybody with a functional brain). I also write as much code as the median engineer on my team (skews junior). Please don't write off the entire profession based on many (most?) being awful - if you work with a good PM some day I promise you will find there is an important point to the job.
I think it's a question of integrity - I have reached a comfortable ceiling in my career, but doing the dumb shit would have got me further, faster. I don't begrudge the peers who have sold out when the delta is $1m+ a year but I personally got into CS for the art, not the money.
A lot of people know the exec bandwagon things are going to fail and do it anyway because of incentive misalignment.
