I have run into a few situations where rlogin and rsh are still being used, but none of the reasons were due to performance vs ssh. 9/10 is due to having to run

I have run into a few situations where rlogin and rsh are still being used, but none of the reasons were due to performance vs ssh. 9/10 is due to having to run down all of the processes, scripts, etc that call out to these. It is mostly as easy as symlink to the secure counterpart.