To send brass to someone else is heresy to a hard core reloader. The "prep" is part of the "fun" and another excuse to buy some toys/tools.
For my .223 I use the Dillon Rapid trim. With a separate de-capping die on the same toolhead as the trimmer, I can de-cap, size, and trim, as fast as I can pull the handle on my 650. My problem is getting a tumbler big enough. My current plan is to coat the inside of a small cement mixer with that heavy rubberized coating used in pickup truck beds, add a cover for the opening, and clean/tumble 5,000 rounds at a time. Primer Pocket cleaning is done with an RCPS cleaner mounted in a drill chuck mounted on a fan motor.
When I do the prep, I KNOW what condition my brass is in. When someone else prep's it, why would they care. Every case is another nickel for them, even if it does have a split neck, blown out primer pocket, or cracked body.