Oh. I don't want to really go down that rabbit hole, but I think the 90 hz refresh rate is completely unnecessary considering the use case of the steam deck. Likely just a function of the oled.
And I do think setting a target refresh rate is probably better in the long run. It encourages people to optimize their performance settings and provides a target.
But also? Fluctuations and "running at the limits of your system" are where VRR IS magic. You never have to worry about artifacts that occur from being on the wrong multiple (especially with the math for why 40 Hz is better than 30 AND 45 for a 60 Hz display...). And that is largely where the Deck lives.
I don't think VRR is essential for the Steam Deck. But I do think it is a "no brainer" that I assume is only not there because of how the (kind of ridiculously) low resolution OLEDs were sourced.
And tinfoil hat mode: It also isn't something that really benefits from reviews. DF might touch on it, but the vast majority of outlets will intentionally set up benchmarks for a stable frame rate and... the Steam Deck is going to continue to be the baseline for all those comparisons. So showing off how good it looks when it is bouncing between 20 and 50 FPS just isn't going to be something that shows up in a GN video.