Rate match to me seems like a particularly bad idea for what is a high-end device. I can't understand why anyone would really want to see a dropped frame every ~42seconds with certain content.
Given the amount of effort folk go to correct colour and aspect presentation, I then find it incredible that dopped frames would be OK. The only time you get an advantage (ie not seeing the resync happen) is when you're going from a 23.976 to 24p source. If there isn't much 24.000p content then there is no advantage to rate match, and if there is lots of content (and lots of sync changes) then it means you're getting lots of dropped frames in lots of content! It seems like lose-lose.
I think the only real place it has is where someone is converting everything to 60p out because they're already tolerant of that video abuse
, and so as there is already a 3:2 telecine conversion happening it isn't so noticeable if sometimes you get and sometimes you get 3:2:3:2:2:3:2. I think folk in the US cut motion a lot more slack because they've always lived (until relatively recently) with the pulldown cadence.
It's worth noting that even if you have rate matching enabled in the Radiance Pro, some source devices don't handle this content correctly. Biggest notable example is the AppleTV4K which only ever outputs 23.976p with 24p content. I noticed this the other day in Netflix movie Triple Frontier which is 24p. Luckily my Sony BD player works correctly and does output 23.976p and 24p from Netflix content.
I've still not really found a good explanation for how Genlock works and quantifying its downside. I know having it enabled is implicated in causing some HDMI sync problems with some displays, but there must be a downside to not having it enabled. I think without it enabled you might also get occasional dropped or duplicate frames, but I believe that their frequency will be related to the fractional difference in accuracy between the source device HDMI clock and that locally generated by the Radiance Pro; and that the dropped or duplicate frame will happen once the drift between the two clocks reaches a certain threshold.