It's also on completely different OSI layer.
I don't see the difference between your comment and a statement like "I don't like email so let's stop using TCP".
But the day your bank and insurance implement WEI, it'll going to be too late to switch to another protocol. Your existence will depend on it.
When you browse to a pristine html page containing zero adtech it contains links. Those links you might click on without first thoroughly vetting them for behavioral exhaust.
Hyperlinks are a vector for contagion. A new protocol creates isolation. What's wrong with both existing? Defense in depth at all levels, I say. You think https can't enshittify, maybe you just haven't waited long enough.