Very well said!In my view, the 350L is a special purpose round which should perform just fine for the narrow purpose for which it was designed. The Winchester hype portrays it as a "Super Round" thereby raising expectations that will not, for many, be met.
I think that is a mistake that will engender disappointment.
It reminds me of a similar error by Savage Arms when they created cartridges ahead of their time for their Savage 99 rifle which was also a groundbreaking design. The Savage 22 Hi-Power was presented as a big game cartridge. Savage went so far as to publicize the killing of a tiger with what we would now consider light for big game. Also, when Savage brought forth its Savage 250-3000, the designer of the cartridge (Charles Newton) recommended loading the round with 100 grain bullets at 2800 fps. But, founder Arthur Savage insisted on using 87 grain bullets to achieve a then unheard of 3000 fps. Savage hyped the 3000 fps velocity of the cartridge ignoring Newton's advice. The result in the cases of both the 22 Hi-Power and the 250-3000 was a reputation as a wounder, not a killer. All of that, of course, was rectified years later but the damage was done.