why cantis?
historical reasons really but…
for racing and some riders or trails they’re good enough. of course part of that is simply because only cantis work directly with road brake levers and that’s all that’s been available.
Now that discs have been allowed for racing and the manufacturers are starting to make road/cx specific discs they’ll gain a foothold. obviously some will always resist change, sometimes with good reason, but as more people try them (rather than just blindly dismissing them) they’ll become increasingly the norm.