Notice the part where @tedivm said "the cost is negligible", not "non-existant". Pure key/value scalar stuff is half the speed of the objects, but its _drastically_ less useful. 

1. Using 1000 cache requests in a single page load is going to be rare.
2. Even when you do 1000 its well within the realms of being perfectly performant. 

This feels like when folks argue over which is more performant: single quotes or double quotes. The answer to that is always "it doesnt matter".