alt Hacker News> To be clear you think an ECS implementation is 50MB?
No.
> Do you think a spreadsheet the[sic] holds a function pointer is a kernel?
Do you think an entire engine, including its system scheduler, is a spreadsheet? If so, shouldn't be hard to apply the same argument to any kernel. Of course, it all relies on your definitions and sense of reductionism.
I think you're conflating other big features of a game engine with a way to store data. If you look at other ecs implementations they are data structures, they don't do "system scheduling" (is that different from regular scheduling?)