In a laptop, low thousands might be about right. And for RAM, need captures it pretty well. Either you will once in your life need to do something that uses 256GB ram, in which case you need it, or you don't.
As for need, as alluded to in my previous reply generally I agree in an objective sense (although uses 256GB does not necessarily mean it needs it either). On the subjective side, I have long-observed that people will blindly assert that more memory is better even when they don't profile their peak physical usage and may easily never make use of the amount they have outside of disk caching. Even if folks don't need incredible amounts of memory, that doesn't necessarily stopping them from wanting it even if it provides little to no benefit.
