That all said, Tricksy wouldn’t do anything if it didn’t block nonmagical illumination, so it’s reasonable to run it as though it does.

That’s my point. It never says it blocks even non-magical illumination, so therefore, does functionally nothing.

And running it as though it doesn’t block nonmagical darkness results in nonsensical behavior. You’re in a torchlit chamber and use the ability - now there’s a cube of darkness, blocking the light of all four nonmagical torches.

You’re in a torchlit chamber and use the ability - now there’s a cube of darkness, blocking ~~the light of all four nonmagical torches~~ nothing. Just illuminated by torchlight until a rule update does something other than make it bigger to fix the issue.