Heh. We call them “Water Bones”. It’s all in the marketing. 
My refrigerator has an ice maker that is supplied from my reverse osmosis water purifier. We use the RO for drinking water as well.
I used to just fill the two little trays with water. It was no big deal, as neither me nor the roomie use much ice. Mostly the cubes ended up in the dog’s bowl in the summer.
Then I got a new fridge and couldn’t find a model without an automatic ice maker (not in the door). The guys who installed it told me that it’s fine not to have it hooked up, but there’s no independent shut-off for the ice maker so you could accidentally activate it and the motor would spin indefinitely, trying to make ice from no water.
I eventually had the thing hooked up and now we have automatic ice. We still don’t use it much, but I do find myself drinking more ice water in the summer. Now I am always pushing ice on guests. “Have some ice! Drink all you want, we’ll make more!”
I don’t make ice, nor do I like lukewarm drinks. I keep drinks in the refrigerator, so they are cold, not lukewarm. I don’t bother with ice because every ice maker I’ve ever used makes garlicky ice cubes, and if I made ice cubes in a tray, I would maybe use two or fewer a week, so they’d taste like freezer after a while, too.
I have an automatic ice maker. I can also get ice through the door, either crushed or in whole crescents, as well as chilled water.
My refrigerator has an automatic ice maker, but I don’t use it. I mostly don’t use ice in my drinks, because I don’t like them getting watered down–I just keep my drinks in the fridge, and that’s cold enough. If I do want an extra chill on a drink, or want to keep it cold longer, I have it on the rocks.
Literal rocks. I have some polished stone cubes I keep in the freezer for the purpose.