I have not been reloading for very long, but I always prep my new brass which includes unforming and deburring primer pocket and flash holes ect...after shooting I clean my brass and yes I clean my pockets.
I even clean my pants pockets, if not the wife gets all my coins and loose bills.

I used to do it, but it made no noticible differense in accuracy in any caliber, so I blew it off.

With a couple of rifles, my loads shoot less than half MOA, so why take the trouble?

I've noticed no difference in accuracy but in my .45acp I notice difficulty in seating the primer fully unless I clean the pockets and I'm loading on a single stage press so I clean them.

I did for many years. I'm tired of endlessly detailing brass, so I stopped and compared the results shooting rifles of proven high accuracy. I can't tell any difference, except I don't spend as much time monkeying around at the bench.

You have folks that reload to shoot and folks that shoot to reload.
Other than the holier-than-thou attitude of some of the super anal, I don't have a problem with anyone detailing their brass to a gnat's ass if it pleases them; it's just not my cup of tea and doesn't fit in with my "rock and a rusty nail" style of reloading.

I ocasionally find media in the primer hole.
I clean with a round tooth-pick. Just the right size and doesn't harm the brass.

For rifle rounds I dont skip any steps.

However in looking at the new Dillon install I can see where it would be nice to not have to clean the primer poskets for the pistol rounds especially. Just insert em, size, decap, prime, and load. I will have to see for the pistol rounds but I am going to try a few not cleaned and see how they do.

It wont take but about 1 misfire to make me do it the hard way though.

I've fired a few thousand rounds through my .45 acp loaded with a dillon and no primer pocket cleaning. No problems yet.

I true up my primer pockets first with a Sinclair tool. This provides a uniform size and depth. Also squares the primer pocket. Once that's done (only need to be done once) I use my Lyman tool to keep the carbon out. I feel all small touches lead to greater uniformity and when all the little touches are done, they all add up to better loads. Can I categorically state it makes a huge difference. Probably not (categorically that is LoL) but I believe it all contributes to better handloads therefore I'll keep doing it till someone proves me wrong.