I don't disagree, but I think there is a distinction between "everything is e2ee, but specific conversations may be MiTM without detection" and "nothing is e2ee and can be retrospectively inspected at will" that goes a little beyond security theatre - makes it more analogous to old fashioned wiretaps in my mind.

Obviously it involves trust that it isn't actually "we say it's e2ee but actually we also MiTM every conversation"