If I have a huge market opportunity and I can grow the business by spending the cash flow, I should do that instead of distributing that cash flow as profits. That opportunity will most likely not persist.
What you are proposing is that businesses should pay taxes on their income irrespective of expenses which is just a good way to break a lot of perfectly good businesses, and reduce the ability for businesses to capture new markets.
There are a number of ways where tax law could better capture the participation of large businesses, but this tack you’re on is not one of them.
One cannot avoid using technically correct terms (“jargon”) when discussing this as the categories of capital are critical to both the essential function of a business and the point you’re trying to make.