Freezeking may not have a problem doing it his way, and he very well may take pride in his work, but I couldn't do it that way, myself. I've pulled brazing trash out of pistons and changed replaceable core suction line driers that were full of crap. Moisture makes the system acidic, which eats away at compressor windings. Non-condensibles rob the system of efficiency and shorten lifespan of compressor.
My take...a CLEAN system is efficient. If it has very little trash, moisture and non-condensibles and is maintained well, it stands a chance to run well for a long time.