I think it'll be a while before most sites even consider adopting this (it's not even listed to check support on caniuse.com), and even if it does become widesp

I think it'll be a while before most sites even consider adopting this (it's not even listed to check support on caniuse.com), and even if it does become widespread, reader mode has style-override controls to make the page more suitable for long-form reading just as it does now.