Are you sure you actually understand these two technologies (WEI and TLS) sufficiently to make these claims?
My problem isn't that I as a developer don't have an option to not implement attestation checks on my own web properties. I already know that (and definitely won't be implementing them).
My problem is that a huge number of websites will, ostensibly as an easier way to prevent malicious automation, spam etc, but in doing so will throw the baby out with the bathwater: That users will no longer have OS and browser choice because the web shackles them to approved, signed, and sealed hardware/software combinations primarily controlled by big tech.
Google can reduce the page rank of websites that dont enable it (or just not give any page rank at all) and now everyone who wants to be found has to enable it
Provenance to the extent it is a problem is already handleable and largely handled. Note that "handled" here does not mean it is 100% gone, only that it is contained. Monopolistic control over the web is not containable.
The people who want to use DRM to solve their problems should just suck it up and find alternatives.