I don't think you need to bother with Metro. I remember the old Stage3 vs Stage1 wars on Gentoo (some 12 years ago now) and everyone will have their own thoughts. I like things to just work with a minimum of hassle. Just crab a stage3 and go.
BTW, you use a lot of Gnome software. The Gnome desktop supports ALT+SUPER+8 to turn on zoom, ALT+SUPER+'=' for zoom in (the +/= key and use '-' next to it to zoom out again). And if you really have trouble the screen reader is ALT+SUPER+S (if orca is installed). There are others like text size and high contrast adjustments, but those don't seem to have hot keys press defined.
Did you have the vala USE flag on? Masking that flag for this build will fix it, but its kinda pointless to have the flag if it doesn't work. And I just did a sync a few hours ago and it didn't fix it. I just did ANOTHER sync (I'm sure glad funtoo uses git and not rsync) and it looks like it might work this time! I always update dependencies and such, so its pulling in a few updates before it does gedit - and its done! SOLVED
I know that packages are sometimes masked for testing. Is it possible to mask a package by USE flags and version and not just version? If this were possible, you could get the latest version where a particular set of USE flags was tested and working. If you need a newer version, turn off a broken flag to unmask the newer one. If you needed to add a USE flag, it would automatically mask the package version that has problems and warn the user you have to downgrade.
But that would depend on a lot of community feedback as to what works and what doesn't. Anyway - it was just an idea.
uudruid74's post in Metro vs Available Stage 3 Installation Builds was marked as the answer