I think that "demographic" (if you will) has been slowly changing ever since Shearwater introduced OC Rec mode and then released the Perdix. I think more and more people are diving recreationally with only a Perdix. They may not need trimix or multi-gas support, but the other features still make it a really nice computer, even for recreational vacation divers.
As someone who does need a computer like the Perdix, my opinion is that the best backup is another computer like the Perdix. If I'm doing a deco dive and my Perdix craps out, I would much rather fall back to another tech computer than to written notes and something in Gauge mode. At the point you fall back to Gauge mode, it means all subsequent dives will have to be planned using tables or planned based on square profiles (or "square" multi-level profiles). At least until such time as you stay out of the water long enough for all tissues to completely off-gas. If I'm in the middle of a dive trip, I definitely don't want to have to do that. Certainly not if I'm going to dive with 2 devices anyway.
The point is, if you're buying a computer that you anticipate relegating to backup duty in the future, you may still end up wishing you'd bought a computer "like" a Perdix. If I had bought a Perdix for my 1st computer, I would have since bought a second one and been done - instead of now having gone through 5 computers to end up with a Perdix AI and a SeaBear H3 (another trimix/tech computer).