not even that. implementing this requirement could be a general work stoppage whenever the senior engineer is in all day meetings or on vacation

With a layout of 4 juniors, 5 intermediates, and 0-1 senior per team, putting all the changes through senior engineer review means you mostly wont be able to get CRs approved.

I guess it could result in forcing everyone who's sandbagging as intermediate instead of going to senior to have to get promoted?