I actually tried installing xubuntu-desktop first (and then plain old xfce) as I fancied switching back to them after a few years using Gnome. But you're defini

I actually tried installing xubuntu-desktop first (and then plain old xfce) as I fancied switching back to them after a few years using Gnome. But you're definitely right that out-of-the-box, XFCE HiDPI support was lacking. Widgets (panels, icons, etc) and fonts all scaled fairly independently, and I gave us after manually resizing a few elements. On Ubuntu 20.04 (with Gnome), it just worked (with the exception of Chromium/CEF/Blink based applications like Chrome and Teams, which needed the aforementioned command line argument to scale them). I actually had to undo most of the scaling changes that came across with my restored home folder. The one other thing I had to change was the Terminal font as the default was a little too small to use comfortably on my laptop screen - I opted for Liberation Mono Regular, 12pt (px?) with 1.10x height. As a former long-time XFCE proponent, I recommend you give Ubuntu + Gnome a try. It's the best it's been since the Gnome 2 days, and is no-where near as power hungry as it has been in recent years. The most power-hungry application I'm running is Evolution, where the webkit process that renders HTML email frequently gets out of control and burns 40% CPU until I restart it (I'd use Thunderbird but the Lightning plugin https://github.com/ExchangeCalendar/exchangecalendar https://github.com/ExchangeCalendar/exchangecalendar to handle Exchange calendar stopped working with recent versions of Thunderbird some months ago).