Pi-hole is my most prized addition to my connected home. It was simple to set up, easy to manage, and easy to access for whitelisting. Now, all of my devices throughout my network benefit from the service, as opposed to relying on locally installed solutions. If you aren't using it, you should!
I see it as an advantage for all the devices on your network. I mean, to block trackers from Windows computers, or Roku devices or android apps. But as an adblocker - I feel like I'm missing something. It acts as a DNS server for your local network and blocks what's essentially a host file. So how does it handle ads served through websockets? How does it handle ads that come from the same domain as legitimate content…
The pi-hole asks you to choose security over convenience, and you must accept that not all apps and services will work.
That's a personal choice you can make for your own setup in your own home.
I've never seen anyone say this _replaces_ your browser's ad blocker though.