I also run a small business and I agree with this. I think it becomes more notable when you have to change the heading on a large company and all its bureaucracy.

It really begs the question "what is a company?" if one can shift between such disparate markets. Surely mission doesn't define a company then. Perhaps ability to accumulate capital for a means?

An organized team of people used to working with each other?

This.

I had a client who once sold anti-virus software and even ZetaOS.

Somehow they pivoted to selling mobile speakers and toys.