I have been doing some 1x conversions on MTBs and CX bikes recently and have to say less is more, especially when it comes to weight savings and single shifter , fewer cable runs etc. - but I definitely don't believe any more than 9 speed freewheels are needed. I wish component manufacturers would switch their efforts into producing some nice shifters as an alternative to the finicky brifters combining braking and shifting, IMHO the humble thumb shifter has never been bettered and I would love to see some well engineered and adjustable/adaptable ( e.g. different cable pull settings for different technologies) thumbies and bar end shifters on the market that have no Di-2 electric nonsense and just shift smoothly and effortlessly - Microshift sort of tried this but there is room on the market for some nice compact do it all shifters and then we can also get back to lightweight and attractive brake levers too. Ho hum, 'progress' seems to be confused with continually pushing the boundaries and experimenting with no regard to ergonomics or aesthetics.