Froome has commented many times on this. Critics, fanboys, media and other industry folks eat up this drama as it makes for interesting conversation on the evolution of disc... if anything, this speaks to the relevance of ongoing issues (not limited to disc lockups at key points in races). Last year for Froome it was pad rub and alignment, this year slow wheel changes at Rwanda. Many others feel disc is a work in progress - 9200 is already much better than 9100 in terms of pad clearance. Squealing rotors when descending and rubbing sounds when throwing down watts have been a staple in every crit race and team group ride that I've been on in recent years... not sure I see that changing anytime soon.