A few things. Firstly, regarding waste cans are actually recyclable unlike bottles. As for buying 1.5l bottle and then drinking only a glass or something like that a day, for some people (talking from my own experience) they don’t drink the volume of the drink, just the unit. 1 bottle = 1 can for me, doesn’t matter the volume 😅 So I usually advocate for reducing the size of units if a person lacks self control.
Well the phone is a bit of a “jack of trades master of none”. You pretty much always will have a better time with a dedicated device, but the fact that the phone is always in your pocket is just so damn convenient.