I own a 29er ht and demoed a Scott Scale 27.5 the other day. It felt no different to 26″ IMHO. 29er I noticed straight away and thought WOW! 27.5 left me feeling meh, there’s no real difference that I can see. As I said all IMHO.
looking on interested here, going to get a 1k (c2w) hardtail soon. Was sold on the scott scale 960, but maybe wait until the 760 is out. The mags seem to rave about the 710, but that is their job to encourage all to buy the next new thing.