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i mean riding non-paved roads ain't exactly new, and the early mtbs were similar to gravel bikes in terms of tire width, geometry (sorta), but i guess the idea of having appropriate equipment for it (and it being more the focus) is newish.
and yea you are probably right: in a few years anyway. the thing that grinds my gears is that they went out of their way to make di2 road/mtb incompatible.
i have an xc bike and a gravel bike. i don't like driving much though so i stick to the gravel bike mostly.
tires that big are for crossover between the two for sure. 2.4" is mtb territory! shit i ride 38s on buff singletrack pretty regularly. ride 30 miles of pavement, then do some cool singletrack or gnarly off-road stuff, then back home seems like the ideal to me. like what rodeo labs do.
https://www.youtube.com/channel/UClhFk2j_PlbE6YmxBRkh2GQ
and yea i know of the spidering. apparently the chainline is a bit wonky and i don't want to get a new crank. i just want shimano to make di2 mtb/road compatible and maybe even the mechanical stuff.