People with emotional issues aren't as likely to be promoted into management. Management is often way more stressful as you're getting dumped on from above, from peer managers, and all the negative feedback from devs all at the same time (plus needing to actually facilitate getting things built). Maybe you work at some poor company that can't promote devs high enough so they're forced into some form of management role to get a promotion. Those companies suck because they steal good IC talent for roles they're less suitable/valuable for, and causes the company to have perverse incentives to over bloat their management pool than necessary.

>> People with emotional issues aren't as likely to be promoted into management.

And engineers who don’t invest in their work emotionally are not usually the best

>> Maybe you work at some poor company that can't promote devs high enough so they're forced into some form of management role to get a promotion.

How does this follow from what I said? Also, I have a bit of experience so it’s not one company

I've worked at several big corps and the managers are the ones who take all the stress. I would never ask one of my team (or one of my colleagues) to work to the point where they cried - this is a negative signal.