> Spectrum looks similar to a 2011 text message client
This just isn't true. Compare [1] to [2]. Nor does it look like VB, phpBB, etc. from 2011.
[1] https://thenextweb.com/apps/2011/08/30/the-top-6-best-instan...
[2] https://spectrum.chat/sketch?thread=5ee6de28-e347-4c0f-950d-...
> .. a good portion of people already have an account on.
Ah yes, my N accounts for N communities on Slack.