Until modern XC bikes came out (2017 Spark RC) I resisted riding a full-on XC bike. My XC race bikes were a Yeti 575, then an Ibis Mojo SL with 26". Then that bike got a 27.5 front wheel in its Maverick fork. Then it was replaced with a 5010. I knew I was giving up some efficiency but if the bike wasn't fun to ride I'd pass it over for my freeride bike.Interesting that you didn't go straight to 29" from 26". I did the same!
Here is what I started mountain biking with compared to what I run today
I also had a single chainring with a 10 speed cassette at some point. 30 or 32 teeth up front with a 26" wheel