I fail to see why a 26" shotgun barrel is considered quite short, but even a 22" rifle barrel is seen as unwieldy?
Because shotguns are made to shoot while moving. A longer barrel adds inertia to the swing and helps with follow-through, which is probably the #1 reason why people miss with a shotgun (poor follow-through).
A 22" barrel with a 7" suppressor on the end of it is 29" of barrel and overhung weight, which, as pointed out above, adds to the movement of that barrel, which doesn't lead to accurate shooting with a rifle.
