[Dragory]

> Email is being replaced by Slack

I don't know about this one. For example, I'm not going to invite every one of our clients to our Slack as a single-channel guest, nor am I going to be joining their Slack workspaces (if any of them even have one - most of them are in the Microsoft ecosystem). I'm also not going to do that with every vendor I'm in contact with, and so on — email is much more convenient. That being said, most of our internal communication within the company is on Slack, but that's a small slice of what emails are used for.

[random3]

I'm not suggesting that it's replacing every use-case for email. But likely 90+% of internal communication within companies that use it. I've experienced this both in my previous large corp (20K+) job as well as my startup (<10).

The main difference is that Slack lacks a unique global id, so you can't add a user in Figma based on it's Slack ID unless you have a Figma / Slack integration. Email still rules for these use-cases - which is exactly why open-standards (such as email, RSS, etc.) are better than proprietary APIs that repeat the same use-cases over and over.