What Twitter client are you using? Mobile web at least threads it just fine. So much so I don’t understand why people use threadreader a given the junk that adds to a conversation as its being requested and replied to.
If you think mobile web threads fine, as in makes a good UX for reading written text, then that difference of opinion is the source of our and perhaps the parent of your post's disagreement. Mobile web looks just as awful as desktop web. I don't understand how people read on sites like this. I never read twitter threads unless I go through thread reader. It's intolerable otherwise.