[Adverblessly]

I actually prefer XFCE's scaling via setting a font DPI to e.g. KDE/Gnome's scaling which increases everything in size and not just fonts.

First because usually it is only text that I want to be larger so I can read it. Increases the size of "everything" just decreases UI density with no benefit (while things that conform to the text like button still increase in size to contain the text).

Second because scaling "everything" often leads to ugly results. E.g. I use a program to browse local media files that generates thumbnails for those files. The size of the thumbnail generated matches the size of the widget it displays for that file. If the widget is scaled 1.5x due to UI scaling, it will show a blurry upscaled thumbnail.