The diverage fits 2.2’s pretty comfortably and even Specialized has touted this. I don’t know if that makes it an “official” tire size that is supported, but whatever… It’s hard to compare all these bikes because manufacturers are using different standards (road vs. MTB) to determine their official tire clearance. At the end of the day, I think 50mm with lots of mud clearance and 2.2’s for dry conditions is going to be enough tire clearance for most buyers. Based on how Specialized rated the diverage, I’d be very surprised if the crux claims greater than 50mm, but hopefully the crux will fit a 2.2 with a bit of margin.
I think 3T checked pretty much every box on their new “extrema” with aero frame and 57mm clearance. The pricing is completely nuts though, 6500usd for a frame and 10k for a rival/GX transmission build.