One downside to this approach is that you still see where the banner was with an "address not found" block. I switched to uBlock origin some time ago which I prefer as 1) it collapses the ad blocks so you never realise they were there, and 2) it auto-updates the block lists for you.
I would say, that rather is an advantage, not a disadvantage. It is good to know after all that /something/ happened so you know that a page might be broken in some way instead of it failing silently behind your back.
That's true if you're prepared to update the file yourself all the time. In my experience there are a lot of URLs to maintain and I am ok with offloading that trust to a 3rd party like Easylist who will maintain the list for me.
Admittedly, I do occasionally have to turn the adblocker off to get a site to work, but this is maybe once a month.
This is the reason I haven't installed Pi-hole. I understand that a broken site may be because of the adblocker and can turn it off in my browser, but a less tech savvy user may not know this. And if they are on a Pi-hole network they won't know or be able to turn it off (I understand there is a whitelist but I believe this is only configured by an admin - could be wrong here).
