It's well past time for browsers' reader modes to be the default experience for unstyled pages. The arguments for not doing this—and keeping a single set of user agent style sheets containing rules that have to match how unstyled pages looked in the 90s—come from a place of good intentions, but are ultimately poorly reasoned and result in one of the worst forms of stop energy. (The strongest argument against is: "my browser's reader mode is worse than the unstyled page", which I sometimes agree with, but is still not a very good argument at all. It's solved by fixing the reader mode itself to be less bad.)