I get that the activity selection was removed from the recording profiles - it didn't have any use, it seems. But now you can't change the profile icon anymore (or I don't see how). Furthermore, when creating a new profile, you still have to select an activity, which now is a bit confusing, as later on the activity isn't mentioned anymore. It's only use now is to choose the icon - but only from the ones defined for activities.
Wouldn't it be better to just add "Choose Icon" to the profile edit dialog, and then offer all icons (just like when choosing the icon for a track folder)?