Same here, still no fix on version 23.1 in 2019. I am on Windows 10, viewing on a 4K screen at 3840x2160 resolution. The problem persists whether I have the Windows 'size of text, apps, and other items' setting at my preferred 175% or their recommended 150% value. It may be of interest that I happen to have another, lower resolution, screen used in 'extend' mode: moving illustrator to that screen the rulers appear normal scale.
Same here, still no fix on version 23.1 in 2019. I am on Windows 10, viewing on a 4K screen at 3840x2160 resolution. The problem persists whether I have the Windows 'size of text, apps, and other items' setting at my preferred 175% or their recommended 150% value. It may be of interest that I happen to have another, lower resolution, screen used in 'extend' mode: moving illustrator to that screen the rulers appear normal scale.