https://www.datapro.net/techinfo/thunderbolt_info.html#q26
However, 60hz vs 100hz does make a noticeable difference for scrolling or 3D work or slow-mo video.
Even 90hz would be good enough of an improvement.
Edit: Oh i didn't mean reducing the PPI in favor of the refresh rate. I meant keeping the >4K and the PPI but pushing the refresh rate above 60hz.
https://www.datapro.net/techinfo/thunderbolt_info.html#q26