> On one hand it sucks to have functionality taken away but on the other hand it protects against potentially large security issues.

Except that it doesn't actually protect against security issues, because v3 manifests don't break the ability to read data, only modify requests. Also, since ads are a vector for malware[0], having an adblocker is a security benefit, not a loss.

[0] ex. https://www.extremetech.com/internet/220696-forbes-forces-re...