You're, perhaps unintentionally, doing a bait-and-switch argument. Sure, communicating about the availability of a product is important; in fact, it's crucial for functioning of a market. But this is not what marketing, or advertising in particular, is about in the real world. It's not what people mean by these words.

I wrote about it some time ago at length[0]; skim the list and tell me how any of that - all of which is common practice and what you get to work on if you become a marketer - how any of that can be justified on the grounds of just "communicating about the availability of a product"?

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[0] - http://jacek.zlydach.pl/blog/2019-07-31-ads-as-cancer.html