What are the arguments for cantis? I mean for Joe Public, not the pros.
The weight difference is of no relevance IMO.
How many disc recalls this year?
And speaking to someone in the industry he is of the opinion that there are VERY few sets of shimano hydro road discs, he had yet to see any, he was riding a set of recalled sram’s ( it wasn’t that cold so no issue….)
Add to that first gen. product, wait a year or two until they work.
For racing, they weigh more and every gram counts, for riding, well that is a different question.
Many cross bikes use hand me downs and any old crap that was in the spares box, the spares tend not to be disc based.
Give it 10 years and discs will be normal, but it is going to take a good few years, roadies don’t tend to be faddish like mountain bikers.