Why do you think the manufacturers would allow that? Sure, you can effectively block ads in a web browser, on a desktop. Everything on mobile is in an app which explicitly does not allow you to tailor your experience, erm, nuke the ads from orbit. And every platform that's followed smartphones, from tablets to headsets, has followed the phone model of pushing software: closed-down OS, software through app stores or gtfo. It's incredibly naive to think ads will get better and not a hell of a lot worse.

Because you can just build things yourself. You don't need permission from anyone else.

A suggestion to build a computer or headset from scratch, having to factor in all the compatibility hoops the big players throw at you before they nuke you anyway for having unsanctioned hardware, is proof of your unseriousness.