Earlier quoted context omitted.
What's wrong with Firefox Focus as a Safari content blocker? I barely see ads on my iPhone and websites breaking because I have an ad blocker is more common than seeing ads.
I've never knowingly encountered a website breaking because I have an adblocker, but I've being running adblockers of one sort or another for about as long as there's been ads on the web - so maybe there's just features I don't know I should experience. Can you give an example of a website that breaks with an adblocker? (Please describe what breaks as well. Otherwise I might not notice it.)
Now that I think about it, if a site wants people to disable adblocking, they should make valid contents disappear instead of begging for it with a popup.