Yikes, that's a long list -- really, opening the windows or the trunk needs an internet connection? That's an absurd design, if true. (Or am I misunderstanding-- are you saying it's just the phone app that won't work to do those things but there is still a manual way to do them?)
Even so, it seems like a poor choice to have the app dependent on an internet connection rather than a local wifi hub in the car or the shared hotspot feature of the phone. But then I'm not a software engineer.
Sorry that I wasn't very clear
As others have pointed out that list I posted was things you wont be able to do remotely via the Tesla app
without a WiFi or cellular data connection for both your phone and the car
It's not a poor choice, currently there is no other way of communicating between the car and your cell phone
over great distances reliably (providing you have a good connection). It's actually a strength not a weakness
With cellular data connection or WiFi you can control the car from your couch or the other side of the world
Having a independent internet connection allows for other advances the future
A local WiFi or shared hotspot would suffer from range and be far to unreliable and limiting
You couldn't garentee that once you've walked to the restaurant you'd be able to turn sentry mode on
or check the car is locked for example.
You can still do all the thing I mentioned from the car just not from the cafe, couch, corner store or Croatia
without cell data or WiFi for the car and Tesla app
Close to the car you will be able to unlock/lock with the Tesla app/cellphone over bluetooth but not much else