As I understand it, Ubuntu by default uses some sort of fork of this extension: https://extensions.gnome.org/extension/615/appindicator-support/
Bits confusing me: In Gnome Tweak, the Ubuntu Dock and Ubuntu appindicators are shown as "off", despite being on. Is this a bug in Tweak? Or is this because of the special Ubuntu session?
With the defaults, the "appindicators" are tiny, but with the proper appindicator extension, they're slightly bigger and obviously look better. Why is the Ubuntu session giving tiny icons in the tray?
Notes, this question also noticed the small icon issue: Ubuntu 17.10 small tray icons
This question also notes the extensions show up as disabled on the Ubuntu session, despite obviously being on: Icon(s) missing from top bar after an upgrade to Ubuntu 17.10
This is not about missing icons.