Slack or not to slack

So, I've been using Slack for a while now. Mostly into cryptos so it seemed necessary for every ico has a slack team.

The platform seems nice, but wait till you start joining multiple teams and realise you cannot sync your desktop app with your mobile app. Soooo frustrating. Not to mention, if you have several laptops, omg. All the advantages of this app seem unrelevant.

So if you join a team from your mobile, you can't see it on your desktop and vice versa.

It is just not user-friendly. Obviously, Slack is for business teams and that's it.

What stays unclear to me at this point is the login process by the same e-mail address, so why can't it be synced? There should be a single unique login...