That is an interesting philosophy, but it has never been true in real life. Every major corporation in the world has added business analysts and PMs. Even the great technology companies you mention have many, many business analysts.

I love finding exceptions to rules, but I can't find an exception to the rule that if you want to accomplish truly great things with your company, you will eventually add business analysts and PMs.

Small companies will realize that the value of having a marketing professional over a "growth hacker" is when the marketing professional can call a major company and negotiate an ad deal due to their experience doing so. Or when a finance professional can help hammer out terms of a new round of debt financing that allow the company to grow without giving up equity etc.

As a business professional, I understand that hackers have value, but I also understand that even HR people have value. Just because I don't know all the value they have, does not mean it doesn't exist.