Ad blocking is not like paywall circumvention. Ad and (what Brave does, don't misdirect or let others who get paid to whitelist ads while not blocking trackers, notably Eyeo who owns AdBlock Plus) tracker blocking is allowed by design of the Web standards, and entails no effective access control mechanism to circumvent.
Script blocking in general is a good idea. Signed, creator of JS.
Signed, an average developer.
I get what you mean: either side of the protocol can do what it wants. Also that the publisher has to cover costs via ads or some kind of payment for content, if they aren’t compensated otherwise (separate business on the side; donations).
But your wording was too broad, as it equates (“no different”) blocking content in browsers, which is allowed by design of web standards for accessibility and any reason the user wishes, and blocking via a server side subscription paywall.
Edit: Just to be clear, I'm actually not against ad blocking. In fact, I use an ad blocker myself. I just think it's hypocritical to expect it to be okay to block ads without also accepting that sites can choose not to serve you (sometimes at their own business peril).