As a developer, that is sound advice. As a user, it's silly. I don't get to decide which websites use flash and which don't, and technical limitations don't dictate which sites I want to visit.
It works for me. That's why I've never been interested in adblocking software. If a site annoys me, I just don't go there any more.
That's why I've hardly ever read any of the nytimes articles that get submitted here. Because they put them behind an irritating signup wall. There's accounts you can find on google but I really can't be bothered.
It's not like there's a shortage of websites doing the same thing.
I agree - plenty of sites, why visit one that annoys you - but I will say that with advertising it is becoming less and less the case that the site actually chooses or even knows what ads are showing on their site.
