Yes, this is an important detail as well.
Make a Slack clone, but have it perform way better than the original (less RAM, CPU usage), with a smaller storage footprint.
Also deliver on features faster than the original. And have those features be more tailored to what the users both want and need - and things they didn’t even know they needed as well.
This is, after all, what’s being promised, no?
Which they do because it means they can ship the same thing in many places (actual browser, cross platform OS and mobile if they're lucky).
And the 'start a thread' nazis are just too much to bear. Prediction: they will add subthreads within 3 years.
Social issues can't be solved by technical means. Just slightly incentivised in some direction (like discord's "this is the third reply, would you like a thread instead?")
But for the resource usage, ripcord https://cancel.fm/ripcord/ already proved you can have a capable client which is super light and fast if you care. This was made by a single person and in many ways is better than the official client.
Well, this was my prediction pre-easy-to-use LLMs, anyway.