I think I'd agree, for short trips or trips when you have a group, a good tire repair kit may be all you'd need. For longer trips or trips when you'd be alone a spare's not a bad idea.I will not.
Ever since buying tires with decent thickness and stiffness (BigHorns), I have not had a tire failure that I couldn't solve at least temporarily with plugs.
Most of the places I ride are not far from a service road where I could either limp back to camp along the road, or have someone go get my truck and limp the ATV to the road to pick it up.
A spare wheel/tire set is bulky and heavy.
If I was doing a big cross-country trip or something with little or no support resources, I might mount up a spare for that trip specifically, but for every day riding, it doesn't seem necessary for me.
I image it won't be long. Someone probably just read this and is now heading to their drawing board, garage or shop to fab one or two different ideas up.I would if someone developes a spare tire carrier for back side of roll cage.