Thanks everyone for the responses so far! I really wasn't sure how this thread would go but the answers have been more varied than I expected. There's no perfect answer, I get that. I did think it was worth asking so I could get an idea if I'd gone totally off the reservation or if the questions I was asking myself were reasonable.
What got me started down this rabbit hole was a really good group (for me) from my G19 last weekend. I carry a Shield, not the 19, and it will be that way until I lose ~50#. I started playing with the idea that maybe I need a 43/43X instead of the Shield and then wondering if the minor difference between triggers is really an issue. That led to "Would it be a mistake to pick up that nicely priced P30SK to go with the P30 or should I get a 43/43X or a second 19 instead? If I get another 19 do I go MOS and get a second 407C or leave it iron sighted? If the 19s go all in on dots, do I get one for the 34?".
I still haven't decided what I'm going to do but it's good to see it's not as cut and dry as I thought it might be.