I do almost everything too.
I deburr all brass with punched primer holes. Have not done it with Lapua yet. In fact, I just did a batch of 243 Saturday, took me about 1.5 hours to do 200, deburr, and chamfer neck ID/OD. I have a drill press, so I chuck the appropriate tool into the press and have at it. Years ago when I started doing load development for shooting High Power, I ran a test using 5.56 LC brass, and found that deburring the flash hole gave positive results, nearly 1/4 inch at 100yds. It was just 10 shots each, probably not even statistically significant, but it seemed to help a lot and was easy to do, so why not?