> …you can still do that on internal email systems; but over the internet any kind of unsolicited short email will probably be dropped by Bayesian filters on the recipient’s side because the information-capacity of a short email is… well, short, making it harder to discern from short spam/attack emails.

I do this all the time. I don't think I've ever had a dropped email, because I always get a response.

> Also, email clients are getting heavier and slower: (Classic) Outlook M365/2025/Etc somehow takes a grating 10+ seconds to fully load and warm-up on my brand new machine, while double-clicking an email to open it makes the whole thing awkwardly hang for 2-3 seconds, even when working offline. It’s given me a huge aversion to using email in general, so I’m not going to send a 1-liner via Outlook.

Does your average human really care though?

Also, mobile email clients (Gmail, Apple Mail) load roughly as fast (or faster) than popular IM apps (Whatsapp, Slack, Discord). Discord in particular is a huge resource hog, with very noticeable load times, and semi-advertisement popups that you have to click through. I have not seen any evidence that this diminishes Discord's popularity.