Neither of your point disproves the fact that it's ridiculous. It's not
about whether you want to run your own applications or not, it's about
having that choice whenever you want to. On every computing device. This
is - or should be - a fundamental Freedom, one which you should not be able
to sign away, not even by an "informed choice".
Citing examples like feature phones and gaming consoles isn't helpful, either. Just because nobody complained in the past doesn't make it okay. Also, as the quite active homebrew scene around most consoles proves, there is value in being able to run your own stuff on gaming consoles. You might remember the deep shit that Sony got themselves into when they decided to turn off OtherOS on the PS3 for no reason whatsoever.
Anyways, I think consoles - while owning quite a few myself - are a thing of the past. They're eventually going to die. The coming next generation might be the last we see.
Will we reach the point where smartphone (or smartphone like devices in the future) are considered computers and we can use them freely? I hope so. It might happen. It might not. What we can count on is there will always be the choice on the market for those who require that choice. Not everyone does. I have a Windows Phone. I've never been bothered by not being able to install my own software. I also have an HP Touchpad with Android and WebOS, the two freest OSes on the market right now. Never sideloaded. I don't need to.
My point? Your outrage is misplaced, for several reasons listed above. People often talk about consumer choice, but the rubber meets the road when consumers willingly make an informed decision (in my case) that the crowd doesn't understand. I bought a Palm Pre not because of the freedom, but because of the UX. I bought a Windows Phone for the same reason. Sometimes a smartphone is just a smartphone. You might not understand my choice, but I do and that's what counts in the end.