From the way folks are posting, I don't think that our two resident naysayers are going to be changing any minds any time soon. And honestly, I don't understand why they are trying to change minds at all.
The 45 already fits in a 19 holster. Many here have that. If one wants to add a comp to a 17, there are almost no choices for holsters unless they're making their own or know someone that does and lives close by. But if they were to comp their 45, they can use readily available G34 holsters. Red dots are making the sight radius argument mute. Add in those wanting the faster slide velocity to return to battery with a comp to negate the flip and aid in muzzle recovery, it becomes very easy to understand. And from what I have heard, the balance even with the add on's is still better than a 17 with the same stuffs.
And as I have said before, I want one for secondary and nightstand purposes. I don't need a do all 19, I never carried mine as I prefer single stacks for my EDC as they're easer to conceal. I don't need things to make sense for someone else, my tools are for me and not them nor seeking their approval.