Originally Posted by
Marcus_Ti
and really don't "just work" outside of sunny dry weather (excepting Di2 or eTap). They're exposed very fragile mechanisms that are easily fouled by mud, prone to bending a "replaceable" hanger that in a few years you'll never be able to source...
We can agree to disagree on this one. I race mtn and gravel bikes. I also keep my bikes relatively clean - after races/rides. I get years (!) out of derailleurs.