In any system, there will be a tension between shrinking cost/benefit, and spending more to achieve better benefit-cost. This has nothing to do with capitalism. It's a fundamental aspect of systems where there is a non-fixed relationship between investment and return (i.e. almost all systems of any kind).
The notion that "[financial] investment and [financial] return" are the only two factors worth considering in "all systems of any kind" is an artefact of capitalist thinking.
That notion is something absent from both text and subtext of my comment. You are the one who inserted it. Investment and cost come in many forms other than the financial.
