I don't think "seasonal sets" will ever happen for me. In the first place, I sleep hot. A summer, spring or fall UQ bewilders me. I read on HF that the general rule of thumb is hammockers need an UQ under 70*F (or is it 60?). Either way, it sounds like marketing to me.
Reminds me of my vet telling me my dog Peanut needed to be neutered. "Why does he need to be neutered?" I asked. He's a house dog - he's not gonna be out propagating the species.
Then the vet tells me that getting Peanut neutered will reduce his chance of getting testicular cancer. Maybe it's just me, but that's the stupidest crap I ever heard. "Can you remove his brain while you're at it, Doc? I don't want him to get brain cancer." Needless to say, Peanut is walking around sporting a full set.
If I ever get cold and need an UQ at 60 degrees, just shoot me. I don't deserve to live.