Most of these proposals would probably make the internet a worse place rather than a better one.

Complete anonymity on L3 would result in all tracking being on L7 instead. Right now at least most people can use Google/YouTube/most other websites without creating an account. With complete anonymity, it's all but certain that all of these would need to be gated by account creation to prevent abuse.

This would actively increase the ability for websites to track you, or else they'd need to be able to somehow handle abuse with exactly 0 information about where any given connection is coming from.

I don't think these proposals were seriously thought out by the OP.

https://veilid.com/

Why do we want to be anonymous? I think if we look at it closely it is for self-centered reasons. We want the video platform but we don't want the ads to know who we are so we don't have to deal with spam (IE pay for the platform we want). We want to comment without editing what we say (troll) and not worry about the repercussions. The best moral reason I can come up with is to avoid sharing personal details that can be tracked back to us or used against us. Before the internet this was called a secret. You just didn't tell anyone. Generally there are ways around all the anonymity concerns that just involve abstaining or giving up feeling entitled to getting things for free or being able to dump our negativity on other "anonymous" people. What's wrong with traceability in all things. If we want to make the internet safer accountability works IRL why not online?