The search and discoverability of XR

WebXR feels like '3D web'-history repeating, however this time we walk GPU's in our gear.
However, how can people easily discover the wonderful 3d content which flows thru these magic chips?
Centralized online stores alone just aren't going to cut it, we know this, we feel this.
Can we find important clues in the history of the web, and could it apply to WebXR too?
Obviously, this is a very complex and loaded question.
The matrix below, triggers some interesting thoughts:

* Aframe and JanusVR are the only projects which promote <a-link> traversal (cross-domain navigation using anchor-tags) in XR
* It seems that WebXR in combination with Aframe is interesting from a semantical linking point of view
* W3C, Google & Firefox are preventing cross-domain WebXR sessions.
* Sadly for WebXR, they seem to superimpose all the security-risks of the 2D web to WebXR: a theoretical chicken-egg dilemma.
* This also demotivates the usage of public, semantically linked assets for proprietary players
* Developers might prefer Aframe (html) markup over 3D CSS for spatial content
* When html-markup is not a startingpoint, semantical linking might become trickier later on.
* WebXR/WebGL/WebGPU might be history repeating itself: first we overcomplicate things (and later a markup language emerges)

The matrix applies scores and criteria's (vertical) to different 2D/3D webtechnologies (horizontal).
The vertical bars represent the total score:

	Importance	delete rename 2D HTML 38 up to 38	delete rename 3D CSS 34 up to 34	delete rename WebXR markup (aframe) 36 up to 36	delete rename WebXR code (exported/threejs) 23 up to 23	delete rename Native XR (Unity/Unreal) 16 up to 16	delete rename OpenXR 15 up to 15
delete 1. semantical linking	3x	Low confidence 3 rate rate	Low confidence 3 rate rate	Low confidence 3 rate rate	Low confidence 1 rate rate	Low confidence 1 rate rate	Low confidence 1 rate rate
delete 2. indexable by searchengines	2x	Low confidence 3 rate rate	Low confidence 3 rate rate	Low confidence 2 rate rate	Low confidence 1 rate rate	Low confidence 1 rate rate	Low confidence 1 rate rate
delete 3. voice input	1x	Low confidence 2 rate rate	Low confidence 2 rate rate	Low confidence 2 rate rate	Low confidence 2 rate rate	Low confidence 2 rate rate	Low confidence 2 rate rate
delete 4. textual input	1x	Low confidence 3 rate rate	Low confidence 3 rate rate	Low confidence 3 rate rate	Low confidence 2 rate rate	Low confidence 2 rate rate	Low confidence 2 rate rate
delete 5. cheap / easy to develop	2x	Low confidence 3 rate rate	Low confidence 1 rate rate	Low confidence 3 rate rate	Low confidence 1 rate rate	Low confidence 1 rate rate	Low confidence 1 rate rate
delete 6. easy to share	3x	Low confidence 3 rate rate	Low confidence 3 rate rate	Low confidence 3 rate rate	Low confidence 3 rate rate	Low confidence 1 rate rate	Low confidence 1 rate rate
delete 7. public semantical linkable assets	1x	Low confidence 3 rate rate	Low confidence 3 rate rate	Low confidence 3 rate rate	Low confidence 3 rate rate	Low confidence 2 rate rate	Low confidence 1 rate rate