I hope it sticks around and is refined further. I started using KDE maybe six months back, after not having touched it in probably 10ish years. Back then I hated KDE but now it’s absolutely my favorite DE. Having regularly used virtual desktops before my switch to KDE, activities are a pretty big part of what I’m loving about the experience. The feature can be clunky in certain ways (mainly moving apps between activities), and I’d love to see further refinement, but even at its current state of implementation it helps so much with my own workflow.
At the moment I run 6 activities: “Default” which generally has a web browser open to my Proxmox servers’ web panel, as well as a terminal, “Gaming”, “Media”, Work (Primary), Work (Secondary), and then “Other” for random crap that doesn’t fit any of the main activities. I have hotkeys set up to easily switch between them, and each taskbar has different pinned apps.
Unfortunately I’m not really a coder so I can’t contribute directly to maintaining it but I do hope the feature is either refined or merged into virtual desktops in a way that keeps its core benefits.