Well, I do think it kinda sucks that I would have to go handheld to charge the joy cons as I would mostly be playing from home (although I love the portability factor), most consoles don't really come with stuff to charge your controllers while your console is not on or you're away from it.
But if it's true that you have to go handheld to charge the joy con, that is a bit annoying but not the end of the world. If people are just complaining that there is not an extra accessory packed in well, that seems less legitimate. I guess it's the price of the thing too.
Unless you have the Switch plugged in while in handheld mode, it will not be charging the Joy-Cons (my speculation since why drain the handheld Switch battery further and reduce playtime?).
Also, not sure about what you constitute as consoles coming with ways to charge the controller away from the console, but both Playstation 3 & 4 came with USB cables and the XBO allows you to swap out batteries.