It’s not senior, or at least not just senior, it’s the process.
You’re doing it for your promotion packet, once you’ve got that in place you leave and your project falls apart because there is absolutely 0 interest or understanding for Sustaining engineering or really anything except “I Made this”.
The smart people hop around while the slow ones try to milk out some promotions to keep going.
It’s a catastrophe, and with the current downturn the politics is turning nasty.