And this is SUCH an important issue, that you are only raising now BECAUSE?
Nobody else expected inclusion of this because no other handheld has featured them before.
Did that stop people from using handhelds on the go (i.e. their raison d'etre)? Get real.
Re: battery, I'm sure you can use auxiliary battery thru charging port like every other smart device.
But sure, you now will barely use your Switch, unlike your constant usage with your assumed feature set. OK. Cry it out.