I remember those, I don't think enough people realised/needed the utility of them at the time for it to gain critical mass. Not that many people in the population at large, have friends all over the world that they need to have accurate timesync with.
It also might have benefited from being based on UTC instead of a decimal time. It was awkward to describe any time below an hour as you needed to break down into fractions of a beat to describe regular time intervals like 15 or 30 minutes. Whereas maybe a UTC-beat watch with 86400 seconds/beats in a day could be more relevant? Probably not, it'd still have huge hurdles to overcome with the network effect, apathy and such.
It also might have benefited from being based on UTC instead of a decimal time. It was awkward to describe any time below an hour as you needed to break down into fractions of a beat to describe regular time intervals like 15 or 30 minutes. Whereas maybe a UTC-beat watch with 86400 seconds/beats in a day could be more relevant? Probably not, it'd still have huge hurdles to overcome with the network effect, apathy and such.