I used to decap rifle brass on my single stage (RockChucker) prior to cleaning. For the actual reloading of rifle rounds, I only use the single stage press.
BUT, I got tired of one-at-a-time decapping and the extra time it took, so when I bought my progressive Hornady AP, I also bought shell plates for every rifle caliber I reload. As noted, I don't actually reload rifle ammo on the progressive, but when I twist out the handgun sizing/seating dies from the AP, install the proper shell plate and drop in the decapping die in station #1, I can feed about 1 case (rifle or handgun) every few seconds - after the decap, it just does the circuit and drops into the catch bin, where the cases get dumped into the tumbler barrel when the catch bin fills up.
I also do decap all my handgun brass on the AP as well to tumble, separate from the reloading steps, since I agree that decapped brass gets the primer pockets cleaner and doesn't load up the dies with residues from my shooting sessions.
O.N.G.