40-45-50 Hz are perfect approximations for fluid frame rates (50 Hz is virtually indistinguishable from 60 Hz).
This can't get overstated how impactful it is. My handheld isn't a SteamDeck but has a screen that supports the same.
It has the following benefits:
- Some games are harder to lock to 60 (especially the last half-of-decade of PC ports with all the stutter issues) but do so much more comfortably at 50hz (or 45hz). The fact you can keep 20% higher settings is just a bonus. It also saves battery.
- Lower refresh rates 30-40hz are super useful in games that aren't so latency sensitive, but again, you want to preserve fidelity AND battery life on.
- 30 FPS (or any other lock) with NO frame-pacing issues. Basically you can just use VSync and ignore in-game caps alltogether.
Full VRR might be nice in the future - but honestly as long as I can access all these refresh rates, it's much less relevant. And I'd take HDR + Low-persistence features over VRR any-day in future handheld tbh.
The issue with battery life, heat/loudness and the fact that it’s an LCD make it a hard sell for me as appealing as it is.
If you can stomach the higher price - the aforementioned 6800U based handhelds solve those issues in many cases - Several have batteries up to 65Wh(doubling SDs battery life when set to same TDP), now in a shell smaller than SD, better thermal management/lower noise, and there's even one with an OLED screen, though pretty much all of them have screens
far better than SD (resolution, color reproduction).
When running at peak Wattage they also trade blows with SeriesS performance wise - but if that's a consideration you might want to wait for 7xxx chipset based devices (which look like may happen this year) that should beat the console on every metric.