And you're asking a company famously burning money building a tool that is used for vibe-coding (aka unreliable software development) to build a replacement?
Idk man.
I can think of a few reasons that Slack could be improved upon. But a lack of AI features is not on that list. Slack is effective for async communication between humans. We don't need AI features to accomplish that, and most AI would just be annoying slop. If you are using Slack for something else, maybe AI features would help those other uses, but you also might be stretching the cases for which Slack is a good thing.
You got me thinking about whether a pre-send message that could theoretically appear: "Given the channel that you are currently in, this might not be an appropriate message. Would you like to reword it, have AI reword it, or send it anyways?"
This presumably would feel absolutely terrible to use, but it might be a way to nudge towards community consensus for how certain spaces would work.