Never a good reason, like different timezones, different working/sleeping hours. Theres no better or worse hour for every single person.

Ok, but where is TempleOS?

If by “functionally the same as any other messaging app” you literally just mean being able to message someone then sure. Like saying steam is functionally the same as aim and thats functionally the same as discord. Also signal is annoying as hell i dislike it, and has caused me more issues than any other messaging service, be that teamspeak, discord, matrix etc. Really the only one ive disliked more that ive actually used is probably skype (rest in piss). So despite using it bc i respect the reasoning and vidion for privacy, it sucks

Thats true this is just the absolute worst use case scenario i can think of

It already is better in a number of games.