I am on Ubuntu Artful (17.10 development branch) and have switched to GNOME as GNOME is the default desktop now and Unity shows some instabilities.

I am using a Lenovo Thinkpad X1 Carbon (2nd gen.) notebook with 14-inch QHD (2560x1440) display, so I am well over the good old 72-dpi CRT resolution.

With some effort I have at least got a somewhat useful scaling of the GUI elements (esp. text size), mainly by getting into Unity7, getting into the Display Settings there, removing my ~1.5 scaling factor, returning to GNOME, installing the advanced settings manager (gnome-tweak-tool or so) and setting a scaling factor of ~2). Large text in accessibilty does not work for me as it makes the text huge.

Unfortunately gedit does not bother on these efforts, it seems to be hard-coded to 72 dpi and so the text is tiny, unusable not only for people with vision problems. As this is the default text editor, which is often also called by web browsers to display text files, this needs to get fixed.