And for the same reasons (spam, "newsletters", etc), I know some people who are abandoning email as well, and instruct people to contact them via a particular chat app or Twitter.

The best ways to contact me are basically ordered by how many of the messages I receive are automated, whether spam or not. WhatsApp is the best way (0% automated messages), then text (maybe 75-80% automated?), then phone (something like 95-99% automated), then email (~99.99% automated, and that's just the stuff that gets through gmail's spam filters)

More machines talking to me = I'm less likely to check messages unless I'm expecting something. If you email me without giving me a heads-up first, there is nearly a 0% chance I'll see it. The only medium where the chance of my actually receiving your message the first try is over 90% is Whatsapp. I used to work to keep the % of garbage down in my email, but realized at some point that I was receiving so few emails I wanted that weren't just transactional messages from a machine, that it was pointless (I can just search for transactional emails if I need them, because I'm expecting them and know where they should be from, so inbox clutter barely affects that use at all).