If we follow the other device's conventions, this would be scale_view(view, 3552).
I believe on 140% scale (the default) it would fail to create encoders and any computer would struggle to render.

Applied, but, yes, I also think it should be adjusted base on the real-world test. 3552 * 3840 * 2 pixels are not that easy for modest computers (and I also doubt extreme high-end PCs will be able to do that too)

Configured it to return scale_view(view, 3552), and it seems the default value (140%) is fine, at least on Radeon RX 9070XT.

I think it is good to go with this value.

For now we can keep it like this, but the solution doesn't scale very well.

I think I'll go for something with 2 levels like

enum class meta
{
  quest_1,
  quest_2,
  quest_pro,
  quest_3s,
  quest_3,
};

enum class android_xr
{
  samsung_galaxy_xr,
  generic,
};

using model = std::variant<meta, android_xr>;

with obviously htc and pico, I suppose Lynx and unknown would get their own categories.

Permissions would only depend on the toplevel, the second one would be used for quirks or resolution override.

I agree on it too. However, I think it should be handled in separate refactoring PR, not in here.