I understand your point, but this is a purely utilitarian view and it doesn’t account for the fact that, even if agents may do everything, it doesn’t mean they should, both in a normative and positive sense.
There is a vast range of scenarios in which being more or less independent from agents to perform cognitive tasks will be both desirable and necessary, at the individual, societal and economic level.
The question of how much territory we should give up to AI really is both philosophical and political. It isn’t going to be settled in mere one-sided arguments.