I'm using Activities as beefed up workspaces to better separate personal stuff and work stuff. And to have different icons and wallpapers. It can be handy and useful on a psychological level imo to have a work activity where I just stick to work and have my work tools in favourities and taskbar and when I'm taking a break or stopping for the day, I can easily switch to free time activity. And I can seamlessly jump between the two and stop what I'm doing and leave everything open without crowding the taskbar or something.

So consider this blog post notice that the feature is at risk of being eventually removed if people don’t step up to contribute technical work to either fix existing bugs, or else overhauling the feature to work differently.

I'd be sad to see it removed completely. I hope they keep it, even if it is left to that "power user" niche.

Personally, I’d like to see Activities morph into a feature whereby each activity has a separate set of settings and config data, but access to all the same user files. On top of that, you would be able to configure individual apps you use in multiple activities (like music players) to use shared settings and config data.This way it would basically be the “profiles” feature that many web browsers have now, but applied automatically to any and all apps you want.

This could be very cool.