Looking like more ebikes moving to 29. I have a 2018 Monterra 2 my first ebike and feel 27.5 is perfect for a ebike. I know there will still be offering for 27.5 but the 29er bug has come. I run 3.0 Dirt Wizards and IMO the best tire overall for traction, turning and just feels secure. With weight of bike as a stabilizer when pushing hard has made me a better turner at speed which transfers over to my 29 analog bikes. I have a long DH and Enduro racing experience, turning and the confidence to do well and fast is one area of constant improvement. Your pssitioning and trust of tires is crucial to do well. In the two seasons I have owned Monterra my turning skills have improved exponentially. In a season or two when I replace Monterra I definitely will looking at a bike that supports both wheel sizes like the new Pivot Shuttle. I like the playfulness of 27.5 too. I run both wheel sizes on my Trek Ex and love the diversity of this, like having two bikes in one!