The truth is that one should be concerned with how much memory is taken in our world of big-RAM consumer computers, too. To do otherwise is purely egocentric, being a bad citizen: he assumes that his software is the only thing running on that system that needs memory. Of course, this concern needs to be weighed against all the other usual concerns of optimization, but frankly, one should not flagrantly waste memory where it is unnecessary. This is a shared resource, not a limitless supply.

We heard this argument a decade ago with CPU. "The hardware will get faster. Moore's Law, lol." Oops?