Not Willing to think "Out of the Box."
I do not own the Five SeveN, but I have shot it, and can confirm the .22mag recoil and extremely inherent accuracy of this platform. I noted this had a lot of the same characteristics as the .357Sig and both are what could be considered a "non-standard" cartridge. The problem is, people like standards because they are very easy to understand and explain and they do not step outside of easily defined parameters. In 1941, it was very easy to explain how a .22, a .38 and a .45 all worked in relation to each other - they all had full metal jackets and they all used the same powder. Unfortunately, 70 years has passed, hundreds of technologies have been applied to firearms, powders, bullet design and the firearm itself, and shooters, gun writers, bloggers and "experts" are still talking and using the platitudes of seven decades past!
The FN Five SeveN is a bottle-necked rifle cartridge with a (roughly) long .22 bullet topping it. The problem with this "simplification" is that it now does not allow the round to be "justified" in people's minds between what it looks like, what the statistics say it can do, and what 70 years of platitudes tell us a .22 can, and can't, do. The fact that it is a dynamically engineered round that is pushing the technological envelope and doesn't deserve to be cataloged with ANY other handgun round doesn't seem to matter to anyone discussing or writing about this round. And the fact that you need to pay over $1,000 for the platform to launch this "over-developed, designer plinking round" is absolutely ridiculous...right? (WRONG!) I mean, no ".22 pistol" should cost over $400, and that should be for one of the good, American brands! (Sarcasm included)
There have been so many things talked about in shooting for so long that many of us now believe they are cold, hard facts, when in truth anything can be changed by the application of technology and human ingenuity. One man started in the '80's reading about "One-shot Stops" and read about it for 20 years, then collected actual shooting data for over a decade to find out how often it actually happens. The compilation of his data can be found in a page
here and it's very interesting. However, it doesn't support the "Big Bullet Theory" for anyone...not .45, .44mag, .41mag or any big caliber. WE ARE IN A DIFFERENT WORLD than back when the only thing you had to worry about an attacker being was drunk...when was that, say, 70 years ago?
Our thinking MUST change and it must change based on FACT. This is one industry where opinion should really not count for anything because too much of it has been influenced for too long incorrectly. I honestly believe we all do it with the best of intentions, but to one degree or another, we have all been poisoned, either through misinformation, or through information that was, in its time, correct, but is now outdated and we continue to pass it along because we have not updated our own "databases!"

Let's be open to new technologies, drastically redesigned calibers (a .22 that STOPS like a .45??? I think I need to check this out more!), new frame materials, and anything else that comes along that could make our lives and the lives of those we train easier if we have the CORRECT, UPDATED information to pass along!