It always seemed as though a lot of Bill Gates's philanthropy broadly followed EA principles. But his foundation and, eg, efforts to eradicate malaria precede this timeline. 

There is lots of interesting thinking in the tools for thought space that intersect with your idea.

A few people with interesting, thoughtful ideas;

Michael Nielsen: https://michaelnielsen.org - eg, https://numinous.productions/ttft/

Andy Matuschak: https://andymatuschak.org - eg,  https://notes.andymatuschak.org/zJrfPCbY7GcpV9asEc8NTVzXTAV4TvRFMuY6

Linus: https://thesephist.com - https://thesephist.com/posts/materials/ 

Language and norms effectively discretize the 0% to 100% scale such that there can be salient intermediate points.

It would be easier to follow the argument if you wrote x —> 100% instead of x—> ∞, given the way you define x.