So you can ship your shitty product and get paid. That’s almost always the reason. Engineers have this annoying quality of asking prickly questions and many managers, or people in general, aren’t exactly thrilled by someone constantly questioning them or pointing out errors in their reasoning.

There’s other reasons sometimes. Control maybe. Maybe they have damage themselves and don’t realize what they are doing. But the big one I’d say is the desire to control the product release timeline.

Btw we all keep saying managers, but I’ve seen structures where the lead engineer is in this position of having personell controls along with technical control and it can be, and in my experience was, even worse.