True, and this isn't a bad goal in and of itself, but what they don't realise is that these 'quick reactions' (aka fundamental low level changes in the product) may require orders of magnitude more work than said executives expect (and in fact, probably the work required is at least linear in the age of the company).
> (they do not have a war chest yet, so those that were not able to react quickly do not exist anymore)
I'd argue that having a 'war chest' is actually detrimental to agility (if you're thinking of agility as 'the ability to perform at our current level in a different field'). Small new companies can pivot extremely fast because even if it means throwing away their whole codebase, they've only lost a few months' work.