[css-view-transitions-1] Can't we just remove `transition root pseudo-element` and `show view transition tree` from the spec? They seem unnecessary.

[Psychpsyo]

View Transitions 1 says that a view transition has a

transition root pseudo-element
a ::view-transition. Initially a new ::view-transition.

This implies that a new ::view-transition gets created for every view transition and they all originate from the document element, all the time.
So then document gets extended with

show view transition tree
A boolean. Initially false.
When this is true, this’s active view transition’s transition root pseudo-element renders as a child of this’s document element, with this’s document element is its originating element.

so that it can control which of these gets rendered and when. (Note: it's only ever one and its contents stop being useful once it stops being rendered)

Would it not be simpler to just fill ::view-transition with content in Setup transition pseudo-elements (like right now), and then remove all that content in Clear view transition? (instead of setting show view transition tree to false) Rendering an empty ::view-transition does nothing, any references to the transition root pseudo-element can just talk about the ::view-transition on the document element instead and, from what I can tell, no other spec ever tries to read from show view transition tree so it's now unnecessary.

TLDR: ::view-transition is already defined, which implies it to exist anyways and there is currently only ever one of them being rendered so I don't see why show view transition tree and transition root pseudo-element need to exist. They seem to be doing a bunch of paperwork and allocations and defining of stuff for no reason.

I ask because I am implementing this in Ladybird and just not implementing these concepts seems like the most straight-forward way to do that. (and I feel like I must be missing something)

[Psychpsyo]

I've opened #12767 to better illustrate the actual changes I am talking about here.