Shouldn't this argue for everyone having long tenures, since it's unlikely you'll actively fire competent employees just because they started at their job too l

Shouldn't this argue for everyone having long tenures, since it's unlikely you'll actively fire competent employees just because they started at their job too long and got too well trusted. Having a few long term employees and a bunch of short term ones is the worst case scenario, since it only accentuates the disparity in company-specific reputation and clout.