For those that are interested. I basically wrapped up xrandr & the experimental GDK WindowScalingFactor feature so that people don't have to decipher how to make it work well. You run the script, select the scale you want and it is that simple.https://github.com/rbreaves/betterScale
https://www.reddit.com/r/UsabilityPorn/comments/ryo099/1920x1080_monitor_w_2880x1800_macbook_perfectly/
Screenshot of betterScale
https://i.imgur.com/u1zuBli.jpg