What I don't get is those who carry a commander to save space then put a big beavertail on it that extends the length .75".
Well, that's expanding the length upwards, not down into your pants. So it's not really the same thing.
And beavertails have some pretty big benefits in terms of shooting if you have a high grip and fleshy hands. I can't shoot more than 3 rounds from a GI-safety 1911 before the blood starts to flow.