It's a concrete measure of available resources. More so than revenue.

It is precisely the opposite of a concrete measure of anything but investor valuation. Investor valuation (or even just asset value, for that matter) doesn't have much weight when figuring out how seriously to take a CEO's words. Revenue at least has a modicum of signal of competency.

Investor valuation directly correlates to capital availability both in the sense of available capital to be raised in the market and as credit lines.

And this is Meta we are talking about not Tesla, it's P/E is like 20 something. The valuation is very reasonably correlated to the earnings.