"Jim Carriere" wrote

It's handy (beta) during taxiing when you can get no or slight reverse
thrust, that saves your brakes and is less workload when you get the
hang of it. It's usually a bad idea to reverse taxi- kick up fod
then roll through it as the engine ingests it, hard to see where
you're going, the nose (or tail) wheel may not castor 360 degrees...
to name a few reasons.

It is also -really- handy for seaplanes, who have *no* brakes. ;-))
--
Jim in NC