I have two monitors side by side forming a combined desktop. One of my personal Krita Workspaces has the dockers floated and moved off onto the other monitor.

I can have as many dockers as I like in any arrangement but I can't stack them to form tabbed docker groups. Have I missed something or can't this be done?
(I suppose that if a docker is floating then it's not technically a docker, just a sub-window.)

If it can't be done, is it worthwhile to make a 'wishlist' bug report for it?

No

If it can't be done, is it worthwhile to make a 'wishlist' bug report for it?

Also no. Like theoretically we could, but we actually removed some docker functionality today because it is really super hard to modify the docker code without creating a massive maintenance burden.

Thank you for quickly letting me know. I'll just have to put up with the untidy mess on my second monitor