trimming/chamfering but I do it by hand along with measuring in an old go/no go slot gauge. But I only load 2-300 a year.
Case lubing for rifle loads. I switched to the wax a few years ago and it’s a lot better. I don’t know why they can’t make rifle dies like pistols.
I don’t reload a ton but wouldn’t mind not have to do that step.
BOTH^^^^
I loaded over 5000 rounds/year for twenty years of match shooting/practice plus a good number of rounds of hunting ammo and hated measuring cases to determine which needed trimming. I hated lubing, and ultimately removing lube after sizing and the trim/chamfer steps. Found it much easier and quicker to trim after each firing (many cases did not need trimming)
Simplified both in one fell swoop. I've used file type trimmers (even made a few universal trim dies myself), Lyman and Wilson case trimmers and drill press trimmers. Found that lee case trimmers using cordless drill as driver to be cheapest and fastest trimmer. Using home brew lanolin spray on case lube....quickest by far.
99% of my loading was done on Dillon 450 presses. The Lee trimmer require cases to be sized before trimming and need to be de-primed. This did add one extra step not usually necessary on the progressive. The first stage of the progressive press being the sizing die, I just loosened or removed sizer die before starting the loading sequence since the prepped cases have already been sized and priming is accomplished as usual in stage 1.
1. Spray case lube on cases
2. Size cases and de-prime on Dillon
3. Using a
very special, one of a kind custom built, patent pending (VSOOAKCCBPP)

(as opposed to home made) fixture which holds the Lee trimmer and a chamfer tool, the lubed, sized, de-primed case is chucked into drill. An old sock is put loosely over the knob on the Dillon (3rd hand if you please).
4. Chuck a sized/lubed case in cordless drill, hold VSOOAKCCBPP fixture in left hand (right handed operator) trim the case and chamfer. With drill still running, use sock (hanging on the Dillon) to remove all lube and it's ready to load. Heck I could have trimmed, chamfered and removed lube on 10-15 cases in less time than it took to type this run-on sentence.