I started off my hunting career with a 7mm Remington Magnum. It never failed me but eventually I was bitten by the "bigger and better" bug. I switched to a 300 win mag which I believed would serve me well with a little more knock down power, if I ever made it to Alaska to hunt big bears.
I shortly realized elk, dear, antalope, and black bear don't know the difference between the 300 and 7mm... it's more about shot placement and the type of bullet being used.
So I went back the the 7mm because of less recoil and better wind fighting capabilities.
Then I was bitten by the "newest shinniest" bug. I picked the next cartridge by going backwards. I wanted the highest BC, highest SD bullet made, which was at the time the 7mm 195 Berger EOL. Then found the cartridge which would push it the fastest and flattest, the 28 Nosler (besides the Allen mags and other wildcats).
After messing with the 28 Nosler for probably 2 rifles, 5 barrels, maybe 2000 rounds within the last year... I don't know it's worth it.
The 7mm Remington Magnum will kill anything. It's cheap. It doesn't kick bad with a muzzle brake. I could hunt around the world and if I lose my hand loads, I can find ammo. I believe it is the best all around, do anything, caliber ever made.
It has better ballistics and more power than all the small target cartridges (6mm, 6.5mm Creedmoor and x47 Lapua, 6.5- 284, the BR range of cartridges, and 308 win). Yet is far cheaper, less recoil, more available and easier on barrels than the "bigger and better" or "new and shiny" cartridges like 26 and 28 Nosler, 300 rum, 6.5-300 weatherby and the like.
I guess I want a valid argument (I hope you win) as to why any caliber out there is better than the 7 mag, because the more I try new things, the more I get pulled back to my 7.