this is true as far as it goes, if you don't use it you do in fact lose it<p>but i've convinced very very good engineers to switch from vim to a "real" idea and their productivity went through the roof<p>do they have a worse memory of the stdlib? absolutely<p>are they spending those brain cycles doing something more productive now? also absolutely<p>where is the line? idk but for me personally I haven't found it yet.