This is FUD at this stage.
I’ve been running Windows 10 in EFI mode on 3 different cMPs for years and years, with many rebuilds (I work in IT), and have not had a single issue.
I completely agree; I’m in the same position as you, and also work in IT
My Mac Pro though is on a much earlier firmware revision than discussed; the 2017 version when 10.13.0 was released to enable APFS boot support.
Just wondering how the two things correlated, as I was considering getting an RTX 2070 to replace my 1080.