Earlier quoted context omitted.
Regarding point #2, many in the finance world (which I work in) consider cash flow positive a better representation of actual profitability than the actual net profit/loss reported on the P&L. In short, cash flow shows if the actual core business is bringing in money or losing money, while the net profit includes a lot of "noise" (probably not the best word to use but can't think of how to phrase this). For example,…
"consider cash flow positive a better representation of actual profitability than the actual net profit/loss reported on the P&L" Wow. What a sad indictment of modern accounting practices that its accepted practice to create 'noise' to prop up a P&L (or avoid paying tax). I suppose you could do this with household expenses, but if you don't look at P&L in a household you would be ignoring things like credit card debt…
Income statements include things like depreciation. That's real, in a sense. It's future CAPEX. But for the present health of a business, particularly a levered one, cash is king.
One way to think of it is in time frames. Cash flows are immediately relevant. If they're out of whack, it's an urgent problem. (They're also the most difficult to mess with.) Income statements are longer term. An unprofitable, cash-generating business may have structural issues with its PP&E, or it may be overleverd, or a bunch of options might have been issued or exercised. Balance sheets are the longest-term statement. (They're also the easiest to mess with.)
Keep in mind, too, that income statements for investors are different from those prepared for the IRS.