Nvidia 10xx and 20xx GPUs can utilize VRR on ALL FREESYNC MONITORS.
While I agree with your point in general, this statement isn't 100% accurate either. More precisely, FreeSync should work on displays that support the feature over a DisplayPort connection, which is the vast majority of them. There are some that only support FreeSync over HDMI though, and those won't provide the feature with Nvidia cards, at least for now.
There is a reason there are different 'tiers'. G-Sync "certified" will work just the same as any G-Sync panel. Compatible etc may have issues. Equally, it may just work.
Some of the issues can be very narrow adaptive refresh ranges, in other instances it's flickering etc. Doesn't mean they 'can't' work, or have G-Sync enabled, but Nvidia are not standing behind those for any performance issues, nor should they (hence G-Sync being off by default).
From everything I've heard, a monitor that supports FreeSync via DisplayPort on an AMD card should support the feature equally well on an Nvidia card. The "performance issues" Nvidia highlighted in that presentation are not compatibility issues. Monitors that exhibit issues with an Nvidia card will tend to exhibit them on an AMD card as well. When the feature first launched, there were a couple monitors that had problems like flickering, but that's because those monitors had design flaws, and it hasn't been a common issue on FreeSync displays.
And for something like a narrow refresh range, that's simply a matter of what features a particular screen supports, since not all variable refresh displays are designed for high refresh rates. Even if a screen only offers a 75Hz refresh, with a FreeSync range of something like 48-75Hz, that's still functioning as intended, and people can still benefit from it, even if they don't get low-framerate compensation to provide wider coverage.
Nvidia's G-Sync Compatible certification program is fine, though the way their marketting department has exaggerated the differences between certified and non-certified monitors could be considered a bit questionable. Of course, the fact that they finally support FreeSync displays at all is good, and at least they don't lock people out of activating the feature on non-certified displays.