I think he means invasive as in it would affect companies' bottom lines more. Imagine something that primarily runs on a razor thin margin and makes up in volume and has $100M revenue and $5M profit, versus a company that has high margin and has $50M revenue and $5M profit. The first would be taxed much higher even though they have the same amount of profit.

Of course, because of the way companies can be structured, [Hollywood Accounting](https://en.wikipedia.org/wiki/Hollywood_accounting) is significant.