You have to plug in a charger, and charge batteries, and swap batteries, which is a lot more effort than simply resting my Elite Series 2 controller on its cradle.
Please.
I plugged my charger in one time: when I opened the package. It's never left its spot.
I don't have to charge batteries, the charger does that for me, where there are always 4 fully charged at the ready, with 2 in a controller. I can also use these for my Oculus controllers, and any number of other electronic device going back to the '50s that may be in my house.
Swap batteries: I can do this in less than 10 seconds. The rechargeable AAs last so long you do this so rarely the inconvenience factor is comparable to plugging in a controller or setting it on a cradle after each session.
Not to mention: I can CHOOSE to get a battery pack if I want to have the same experience you're describing.
Your argument against convenience amounts to nothing in reality.
And there's no scenario that exists where if I forget, I'm having to use a cable/cradle in order to play.
Going with an internal battery for the Elite 2 is a regression from the Elite 1. I have both of them.