roverpig hits the nail for me..
I´m gone through so many new standards..starting with the revolutionary 1 1/4 headset standard 1989 (yeti)…which vanished a couple of years later…
until the “revolutionary” 27.5″ today..
nearly every standard has changed through the years..mostly in a way that you can`t use your old bits anymore..(forks ! 1 1/8 argyles are more expensive than pikes now !!)
money makes the world go round..
but..I´m riding 26inch HT and fullsus and a 29inch HT..
horses for courses..really like both sizes..
and I had a 27,5 HT frame, which I just sold to a mate..
it was not that bad..but also not that good…it was not as good as my 26″ and not as good as my 29″ ..something in between, being closer to the 26″..so for me just no reason to change,
the only thing which is quite good ..: 27,5 innertubes!!..I guess they fit in 26″ and 29″, so I don`t need different spare tubes in my old and trusty camelbak…. :-)