The plague of the grey icons
Ugh, what's with this horrible plague of grey icons that seems to be spreading? Libre Office also seems to have done the same recently.
The things that help us identify and distinguish between toolbar icons, so that we can quickly pick the one we want to use, are shapes (outlines), objects (the thing(s) in the icon), and colours (multiple colours, colours representing the real world objects, or different colours for different icons just to reduce homogeneity).
If they reduce the identifying features to just one, a crappy silhouette outline, that removes 2/3 of the identifying features, and makes them 2/3 less usable.
Is this just typical Gnome stupidity (I remember when I used to quite like Gnome, but they seem to have increasingly become hyper-minimalising UI-destroying zealots), or a misguided attempt at "accessibility" for colour-blind users?
Reducing usability for the majority, so that all have the same disability, is really not the way to do this: yes, we add long access ramps to station overbridges for very good reason, but that doesn't mean that we don't also have a more direct flight of stairs for those who can use them.
These icons are so indistinguishable that they would almost be better just replacing them with text boxes which have the name of the feature written in them instead!