It is immensely frustrating and a PitA effort-sink when on installing a much needed Gnome (or other non-KDE/Plasma native) app the fonts don’t match what I’ve chosen for KDE. Sometimes it’s merely an aesthetic difference - a different font/glyph/font family - which, as a designer is more traumatic than you might think, but more often it’s also a size issue, rendering the new app really difficult to use if its font comes up too large or too small.
It would save a lot of effort to have an automation that can deal with non-native apps; knows where the appropriate config is and can, in the install process offer to harmonise the visitor’s visuals (font, font-size, colours) with the native KDE/Plasma choices. A stretch goal could be to map the app’s dialogues to native ones - but I guess that’s quite a big ask!?