Re: OP. Need hasn't got a thing to do with it!
Sincerely. bruce.

I experimented with a 7mm Rem Mag, just to see for myself, if it was, or could be, better than a 30-06. I decided: Yes, at the camp fire. Otherwise: No, because of the exaggerated muzzle blast, the bbl heat, the shorter bbl life, the short brass life... If ya can't be happy with what puts meat in the freezer than don't complain about engineering. Also, how can it be that I won the leg match at phoenix 2001 using a M1A, 7.62 over all the other Matty Mattel black guns?
Arguably all you need is a Model 10, a 10/22, a Remington 870, and a bolt action 30/06. But what fun is that?
Actually we could have stopped with the 30-40 Krag, it had all the energy needed for hunting and SD use.
It was the only time that "Over Kill" came to my mind when, back in the 70's,
I shot a little Black tail buck in California, that probably only went 140 pounds, with the 180 gr RN ammo.
Just depends if you need a bowling ball or a Ball bearing, for the job at hand.
My uncle hunted everything from antelope to moose with a Model 70 in 30-06. Birds with a Model 12 and small game with a no-name 22LR. He didn't "need" anything else. He wasn't a gun aficionado like most of us, so "want" didn't enter into it.
30 Super Carry? 115 gr. Gold Dot at 1150 fps. Higher magazine capacity than 9mm. "New and improved" semi-auto cartridge seems to fit the 25-32 "hole". Some may like it, some may get one just because it's new...About the only hole in the spectrum is a rimless centerfire between 25 and 32 cal in about the 1200 - 1700 fps range.
There's been a few tries, usually squandered in some pistol.
Essentially, it'd fill the role of the 22LR, but be reloadable and cast lead friendly