For music I'm in your camp, Dennis. There are cases I've experienced where huge headroom is required. For example, a recording of my wife rambunctiously playing her largest drum kit in her 3800 cubic foot studio. Rim shots or an aggressive kick on her 22" bass drum, not to mention hits on various large cymbals, produce sound levels well in excess of 100db. The few times I've tried to reproduce recordings of that kit made in that room on my music system, I don't think the Salon2s with about 450w/ch really did it with complete fidelity. On the other hand, I don't really want to listen to a big drum kit in a residential room. In her live performances I tend not to be present if the average sound level is going to exceed about 85db, and often it does. It hurts. Listening to fusion jazz in my large (8000 cubic feet +) listening room I may occasionally see peaks in the 92-94db range at my listening seat. That's about it for me. Loud, to me, is 80db on average and maybe 88-90db on peaks for any acoustic music.
But the S7ts, I assume due to their THX rating, are aimed at home theater systems, and I know some people who want startling special effects. In demos some have done for me I've measured peaks of 104db, and had comments that they turned down the volume for my delicate ears. IMO, there are a lot of well-heeled HT nuts out there, and these speakers just might be what they're looking for. Nonetheless, the measurements James did are truly impressive, and if the S7ts sounded better than my 11 year-old Salon2s, I'd seriously consider a pair, and retire the Salon2s to our HT system. They do look like a relative bargain for the performance and build quality. I just wouldn't be stressing them much.