Adblockers can do more than just block ads, they also allow you to customize websites. As a simple example you can remove the annoying headers on youtube channels that take half the screen:
It’s also great for news sites. I have a filter to remove articles on topics I don’t care about. I also have rules to prevent these sites from automatically reloading after certain amount of time, something that I find very annoying.
Different person here, would love info on removing headers, if you would be so kind!