> Slack has been on a slow rachet up in prices and has struggled to introduce compelling new AI features

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.