I am a lazy sort and on my range guns I admit I don't even clean every time I shoot . If I have only shot a box or two I will give the gun a quick wipe and toss it in the safe.
If I have shot several hundred rounds I will patch the bore , wipe and lube the bolt and carrier and then store.
Any time the gun looks really gritty I then go to town ,break down the bolt includeing the extractor and clean everything .
I do not replace extractor springs or inserts unless they are trashed or the gun isn't running corectly.
I shoot mostly full sized rifles (very little carbine use) and just use the standard grade blue or black inserts. I have never felt the need for o-rings or the high priced (enhanced)
inserts.
I carry and use oil and I carry some spares (includeing extractor and springs) . Honestly I can not remember any failures on any of my AR's . Basic cleaning and a bit of oil and they run.
I am "The ar guy" at my club and problem guns are brought to me every week.No oil,crappy ammo with no cleaning or oil.guys takeing stuff apart to clean or "fix" and not putting it together corectly pretty much covers the problems. Usually I give the gun a bit of oil and grab my mag with good ammo and it will run just fine.
Don't overthink the gun. The bugs have been worked out years ago and most of the "stuff" guys are trying to sell to make it better is just not needed