If I learn to write news articles by reading the NYT, I’m not then able to duplicate myself infinitely and fill every role at every news publisher. I am but one human, producing one human’s output and consuming one human’s space within whatever pursuit I undertake. Critically, I still leave room for others to do the same thing.
Eventually I also die and then someone else can come along to replace me. I’m finite, AI is not. It doesn’t get used up or retire.
If you consider that there’s a fixed amount of societal capacity for whatever undertaking is in question (news journalism, art generation, etc.) then as a human, I take up only a certain amount and only for a certain amount of time. I will never arbitrarily duplicate to produce the work of 10, 100, 1000, etc. humans. I will also shuffle on after about 50 years and someone else, having potentially learnt from me, can now gainfully exist within the world in my stead.
The capacity for infinite commoditisation that AI brings is necessarily a critical distinction to humans when it comes to considering them performing equivalent functions. They must be treated differently.