For VCs a compelling product means great traction but to get great traction you need initial funding so it's always a catch 22.
Even just having people on a waitlist can be all you need.
That's the minimum bar without traction however. A regular genius isn't that impressive.
Like in all fields, true competence comes with a deep skepticism of one’s own capabilities. Especially in a field absolutely chock full of luck, uncontrollable variables, motivated reasoning, and outright deception.
The most competent at this would sensibly not be relying very much on slides at all, and capable of clearly seeing beyond the factors like luck and uncontrollable elements.
It couldn't happen overnight, and especially not in a single slideshow, much less an email.
What happens when a founder is open to investment and only a super-genius capitalist would be appropriate?
The relevance of a slideshow might still mainly be in the "signaling" more than anything else.
Getting the critical capital to get there is big problem, and I recall some places explicitly snubbing VCs after having to get to "impressive" without them.