Yes, Zulip has the disadvantage that the UX isn't exactly the same as every other chat program, so it takes some getting used to. The UX is great, it's just different enough that people don't grok it immediately, and that's too much for people unless you start with a core that's using it and grow the company around that (hard to do with an already established company).

I'm afraid I don't know of any videos, but I tell people "Zulip is exactly like Slack, but everything is a thread, and you can zoom in and out of threads" and find that that's basically enough for them to get it. Maybe try that with a few people and see?

We do something similar to Zulip that is (in my opinion) a little easier to use, Aether (https://aether.app). Its also thread based, but it’s a little more in the line of Slack and Discord in terms of design. So far as we can see it’s been a fairly easy uptake moving from there.

Also helps that we have a full email coupling, so if someone in your team doesn’t like or want to use the app, everything will stream to them just as regular email threads they can respond. This is useful for older folks who prefer email, or higher up people who don’t want to deal with an app but still be able to follow what’s happening.

Here’s a comparison of how that works in one image: https://i.imgur.com/wLFnIyn.png

If you’d like to try it I can throw in a discount code, just reach out - my email is in my profile.