It increasingly looks like modern email is not really usable. But when looking for an alternative, it's not really there - even with some capabilities missing.

It increasingly looks like modern email is not really usable. But when looking for an alternative, it's not really there - even with some capabilities missing. It's interesting why. Surely we can supply HTTP(S) URL-based addresses instead of emails when communicating with people or with flexible enough software. Some inflexible contacts can be coerced. What we need however is a system, preferably known enough to present an alternative.