There is a new mouse trap out there every day. Its probably okey wildcatters are always eager for something else to play with. I happen to be at times and have quite a few. Most of the time there is something already out there. Its another version of drag racing bullets. Most of my wildcats I have for a personel reason and enjoy toying with them. I actually had 7 Stw 5 years before Layne Simpson from Shooting Times introduced it. We called it a 7mm x 8mm magnum.
If you get one and hunt the same animals at the same distance as before it will become apparent quickly that it was never needed in the first place.
"Need" is a word that most rifle cranks have long ago stricken from their vocabulary. If the vast majority of us were real honest with ourselves, we could buy almost any brand of rifle in 30-06 and do everything we do with no issues. Yet, many of us own many other rifles.
The 26 Nosler isn't anything I'm running out to buy...I have a great shooting 264WM...but it's interesting.
As far as "overlap" goes, I've got that in spades. Two 30-06's, a 300WSM, and a 300H&H. No, no overlap here....