This is hilarious. I ranch just off the north edge of the Hill County and I can take 600 yard shots at whitetail if I want to, even down here in the chopped up, mismanaged, micro-homestead environment of North Texas. I just about have to take those shots at 'yotes because they won't come in closer anymore. Just taking random hiking trips in the summer in CO and I'll see elk anywhere from 300 to 2500+ yards. As many sheep, too. Got a look at a MOOSE lounging in a pond last summer by the Mt Bierstadt trail, one of what wildlife scientists assure me is a population of less than 3,000 mature animals in the entire state. So either I'm a magician seeing a super rare animal at a range you've never dreamed of, or the real reason you've never seen a shot past 600 yards is you simply haven't looked.
The answer to shorter-barrels-for-suppressors is a bigger case. If 50-150 FPS are the absolute end all, be all of hit-or-miss for you, step up a level. 7 TCU, 7-08, 280 AI, 7 Rem Mag, 7 RUM, 7-300 NMI, and I'm sure someone has put a .284 bullet into a full-sized 338 Lapua case by now. Every option exists for just about everything at this point. Most shooters are way over-gunned anyways, anything bigger than a 30-06 is entering 'want' territory over 'need' unless what you're shooting at might try to eat you. I won't ever judge anyone for shooing a 'want', except when they try to use that to justify someone else not being as over-gunned as they are if they chop the barrel for a can.
I would struggle to tolerate anyone complaining that a suppressed 7 Rem Mag with a barrel cut to 280 AI equivalent muzzle velocity is somehow undergunned unless they lay out the exact case of why the 280 AI wouldn't work int he first place. If they laid out that case, then I would say either 1) sure, don't use a can, 2) try a CF barrel there buddy, or 3) have you ever heard of the 7-300 NMI... cause it'll change your life
I just changed my daily poodle shooter from a 6CM to a 25 CM, simple reasoning was the 25CM I bought is lighter and has a shorter barrel, and the ballistic differences are so negligible as to be ignored where I shoot.