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The problem is you then need to add a barrel adjuster with the mtb derailleur which adds to the weight.
And the cx1 rear uses a different movement, specifically designed for 1x. The mtb derailleurs with the same movement - x1, xo1 and xx1 all work out as the same price if not more than the cx1.
@kyttyra they are, you just need the knew di2 xtr mtb rear derailleur and some di2 ultegra shifters, get your wallet out ;)
Can't:
Too bad that shimano clutch deraileurs are not compatible with shimano brifters.