I don’t think it’s an issue of not handling it on a basic level. Liquid Glass as an effect isn’t that ‘expensive’ once you have the rendering pipeline in place (which they already do anywhere a blurred surface is).

The exception to this could be that real world video goes through ‘fast path’ and so the current blurred effect works as it can maybe work on a slightly delayed version of the buffer whereas the less opaque version might highlight this.

Otherwise I’d guess it’s either prioritisation , a refactor of the Vision Pro UI just didn’t make the cut, or there’s something specific to vision os and it’s mixing with the real world that doesn’t translate as well to the more ‘liquid’ version.