If I am correct, your argument boils down to blocking happening outside the direct control of the user. This technically is true, as you don't have an icon in your browser like you would have with an extension.

At the same time, it being outside the control of the user is not really true if the user is also the person in control of the blocking solution. I don't know how it works with AdGuard, although I assume it is the same. Pi Hole offers extensive insights in what requests are being blocked, from which client and when.

This can even be adjusted on a per client level. Making that argument a more theoretical rather than a practical one.