To maximise battery life I've run my iPhone in dark mode ever since my first iPhone OLED screen and personally I like the dark mode icon setting to take me one step further (I'm not saying it's giving me any more battery saving but it just completes the dark aesthetic for me).
The problem I see though for people who are very fussy about aesthetics is that, unless you only use Apple apps, we are at the mercy of third party developers at least in these early days. I just tried the dark icons option and my home screen looks great in dark mode - except for the Microsoft OneNote icon that ruins the whole thing and is making me prefer to stick with light icons for now.
I think this is going to be one of those settings that I play with for 5 minutes every few months and if all my apps have released acceptable dark icons, or at least all those that I have at the top level on my home page as opposed to within folders, I will go dark permanently but until then it isn't an option I'm going to use yet.
The problem I see though for people who are very fussy about aesthetics is that, unless you only use Apple apps, we are at the mercy of third party developers at least in these early days. I just tried the dark icons option and my home screen looks great in dark mode - except for the Microsoft OneNote icon that ruins the whole thing and is making me prefer to stick with light icons for now.
I think this is going to be one of those settings that I play with for 5 minutes every few months and if all my apps have released acceptable dark icons, or at least all those that I have at the top level on my home page as opposed to within folders, I will go dark permanently but until then it isn't an option I'm going to use yet.