Earlier quoted context omitted.
Yeah, I know there are extensions for this. I was talking about what I wish for--browsers blocking all the extraneous requests by default and just showing me the page content alone in reader view without downloading all the additional crap.
It's worth considering that one of the many, many wonderful things about the modern internet and modern browsers is that you don't have to sit and wait passively for someone to deliver the experience you want to you. You have everything you need to make Firefox or Chromium do it for you! Then you can share it with others, and they can have the automagic, fresh-from-the-box, on-by-default experience you would like.
I made a simple statement about what I wish browsers did by default. That means no extensions. That means that--unless I'm going to fork a browser to build it myself--building yet another extension to do these things in a sea of extensions that do these things still doesn't change what I wish browsers offered by default. You're now the 3rd person who has appeared to misunderstand the intent of my comment(s).