I mean, I do look for ways to avoid getting online. And subscribe and save requires you to guess what regular delivery schedule would work for the item, whereas this let's you simply respond to running low, which feels much more natural.
I don't buy enough stuff for these to be worth it and I wouldn't want to skip comparison shopping with other sellers, but I don't see that it's such a terrible idea. I've even heard people throw around the idea before of a "smart fridge" that would monitor when you were running low on items to generate a shopping list or even autonomously request deliveries.
But, yeah, I'm freaked out by all the single-serving heavily-packaged stuff too. Keurig, Tide pods rather than a regular bottle of Tide, single-serve mac'n'cheese, smart water, whatever that Olay stuff is in the cabinet, the single-serve coffee bags (because you need that in addition to Keurig?), not sure what all that's about.