In this case I'd quibble that it wouldn't need to guarantee a specific algorithm, just a minimal set of properties. If the user can't manually set the seed then

In this case I'd quibble that it wouldn't need to guarantee a specific algorithm, just a minimal set of properties. If the user can't manually set the seed then they'll be no expectation that it's deterministic or follows any particular algorithm. So the precise implementation can change with versions or even platforms. Javascript's Math.random and Crypto.getRandomValues works this way.