[css-sizing] Should contain-intrinsic-size: auto really care about being relevant to the user for content-visibility: hidden?

[Loirooriol]

From https://drafts.csswg.org/css-sizing-4/#valdef-contain-intrinsic-width-auto-length

If the element has a last remembered size, is currently skipping its contents, and is not relevant to the user, its explicit intrinsic inner size is the last remembered size.

Why check "not relevant to the user"? For content-visibility: auto it's fine, since it only skips its contents if not relevant to the user, so the conditions are equivalent.

But content-visibility: hidden always skips its contents. So having to check if it's relevant to the user means that the position of such elements will need to be tracked with contain-intrinsic-size: auto, even if content-visibility: hidden doesn't normally require so.

This was added in 839ae05. Was it really needed?

[Loirooriol]

Resolved to drop the condition in #6308 (comment)