I have a whole-home water filter, and fill up a jug from the tap that sits inside my fridge until I'm thirsty.

I have never understood why people take extra steps, have extra inconvenience, and have more expensive, harder to replace items just for the sake of saving, what, fifteen seconds filling up a pitcher?

Fifteen seconds 1500 times stops being negligible.

And it is more convenient in multiple ways. Also you don't mess up the nice cold air in the fridge.

It's a tradeoff but it's not a lopsided one.