I hear that all the time and it's really kinda nonsense.
No matter how many guns you have, you still have "go to" guns which I shoot as much as anyone shoots their lone AR-15 or bolt action.
My conceal carry is one of three depending upon specific need. My SHFT guns are a primary AR-15, one of my MP5s and my Benelli M1S90.
The only difference is I can grab very "specific use" guns if I choose to. And you know what? You can either shoot or you can't shoot. There is something to "knowing" your weapon but I can toss a FAL to a good shooter who has never shot a FAL before and guess what? He can bang the 9 ring all day long.
While I understand what you are saying, and while you may say that the reason is nonsense, that was my reasoning from going from "collector" to "shooter". While nothing close to the ballpark you play in, I used to have about 15 ARs, 5 HKs (but only if you include Greek "clones" and PRT-91 clones), a couple FALs, 20+ shotguns, and a whole slew of bolt and lever guns in various calibers (and that's just the long guns.)
I thought each of these guns had a specific purpose when I bought them. The ARs had different barrel lengths and different optics, the shotguns had different lengths and weights, etc.
At some point I sat down with pen and paper and started figuring that
a) I bought them to shoot
b) I wasn't shooting all of them enough
c) I couldn't even remember what range most were sighted in at
d) many of them served no "shooting" purpose that wasn't covered by another one. Sure, they were different, but not in ways that actually mattered to me for shooting.
In your mind if I can get a good sight picture and a good squeeze I can hit the 9 ring all day long. That might be true, but only if I know what the gun is sighted in for and what the bullet is doing ballistically out of a certain barrel length.
So a while back I started selling off parts of the collection. I'm down to 1 ptr-91. 1 FAL. I'm working on getting it down to 3 ARs.
I don't feel as though I've lost any versatility in the collection. Shooting wise, I can still do the same things. In fact, I can do the same things, but quieter, since I took a lot of the money that suddenly appeared and put it towards suppressors.
I think that is the answer to your question. You can shoot, and you have your guns that you shoot often, but you also like having special variations in the safe that hold some value other than their shooting capabilities.
Some of us only care about the shooting. That's OK, nothing wrong with differing viewpoints.