I think that the "Recent", "Beatmaps" and "Historical" sections on profile pages should be changed to be specific to the selected mode. The "Recent Plays" within the Historical section is already mode-specific, and I believe the other sub-sections should be treated the same.
The most notable effect of this change would be making the "Favorites" section a lot neater. Some people tend to favorite dozens, if not hundreds, of beatmaps across several gamemodes, so enacting the change would make reading through the Favorites section a lot less of a hassle in certain cases. The same is also true for the "Most Played Beatmaps" section.
Also, enacting the change might help new players tell modes apart from each other. Maybe.
Overall, it just doesn't make much sense for beatmaps from other gamemodes to appear when another mode has been specifically selected.
The most notable effect of this change would be making the "Favorites" section a lot neater. Some people tend to favorite dozens, if not hundreds, of beatmaps across several gamemodes, so enacting the change would make reading through the Favorites section a lot less of a hassle in certain cases. The same is also true for the "Most Played Beatmaps" section.
Also, enacting the change might help new players tell modes apart from each other. Maybe.
Overall, it just doesn't make much sense for beatmaps from other gamemodes to appear when another mode has been specifically selected.