I'm most curious about the upcoming Microshift 11-38t cassette. I recently picked up their 11-48t 10 speed alloy spider cassette on my GRX franken-build (GRX 400 10 speed shifters, GRX 812 RD+10 speed GoatLink) and it shifts surprisingly smooth. 11-38t seems to be the middle ground between an 11-36t and 11-40t cassette and could possibly clear on a GRX RD without derailleur extender.