I like this idea a lot, but the one thing I don't like about the current version is the headache I get from looking at the moving diagonal gray-and-white bars covering the screen while a new filter is loading. I think this is already distracting in existing interface elements (like the top bar of the notifications dropdown) but it's even worse when it occurs over such a large screen area which is already busy and full of text.
Topic on Talk:Edit Review Improvements/New filters for edit review
Interesting feedback. Thanks for mentioning. I'm bringing our designer, @Pginer-WMF, into the discussion.
Thanks for your feedback, @Opabinia regalis.
The diagonal lines are the default activity indicator used in the UI library. I agree that it is quite noticeable in the results area, and we can explore more subtle approaches (I created a ticket to capture ideas). the loading indicator should also not affect other filtering controls since it is preferred not to block user interactions, even if data has not loaded yet.
moreover, it's a problem for people with equilibrium disorders, who are particularly sensitive to moving images :)
The loading moving grey bars have been changed: loading is now symbolized by three moving dots.