Apart from history and (dis)advantages, nobody seems to address the site's rationale for this (rather impactful) idea:
> would make all the mental math we have to do when adding and subtracting time so much easier—especially when it comes to different timezones
First off: the time zones argument is BS. And the people I know have no problem subtracting or adding (quarter, half or whole) hours to a given time. It's a skill we picked up at primary school, so it really can't be that hard. The people who can't do that, probably also will have problems with decimal time. The only thing that takes more mental effort is something like "193.8 minutes after 17:03", but how often that does happen?
The argumentations following the rationale are also BS: there's no AM/PM in a 24 hour clock (as mentioned in other comments), and there's no advantage to 3.33 vs 8 hours of sleep.
IMO there are no advantages, and the page doesn't discuss overcoming the disadvantages and how to overcome them, so frankly is irrational. There's no reason to discuss this.
> would make all the mental math we have to do when adding and subtracting time so much easier—especially when it comes to different timezones
First off: the time zones argument is BS. And the people I know have no problem subtracting or adding (quarter, half or whole) hours to a given time. It's a skill we picked up at primary school, so it really can't be that hard. The people who can't do that, probably also will have problems with decimal time. The only thing that takes more mental effort is something like "193.8 minutes after 17:03", but how often that does happen?
The argumentations following the rationale are also BS: there's no AM/PM in a 24 hour clock (as mentioned in other comments), and there's no advantage to 3.33 vs 8 hours of sleep.
IMO there are no advantages, and the page doesn't discuss overcoming the disadvantages and how to overcome them, so frankly is irrational. There's no reason to discuss this.