Did we kill Linux's killer feature?
A few years ago we were able to upgrade everything (OS and Apps) using a single command. I remember this was something we boasted about when talking to Windows and Mac fans. It was such an amazing feature. Something that users of proprietary systems hadn't even heard about. We had this on desktops before things like Apple's App Store and Play Store were a thing.
We can no longer do that thanks to Flatpaks and Snaps as well as AppImages.
Recently i upgraded my Fedora system. I few days later i found out i was runnig some older apps since they were Flatpaks (i had completely forgotten how I installed bitwarden for instance.)
Do you miss the old system too?
Is it possible to bring back that experience? A unified, reliable CLI solution to make sure EVERYTHING is up to date?
Is it true flatpaks take up a lot more space due to bundling in dependencies etc?
The short answer is "yes, but only as much as it needs to". Flatpak had to make a decision between "do we guarantee the app will work, even with system upgrades" or "do we minimize space" and they chose the former. The minimum necessary dependencies will be installed (and shared) amongst flatpaks.
Have you had the unfortunate experience of a utility or program losing its packaged status? It's happened to me before--for example fslint. I don't think this can happen with flatpak.
Space usage under flatpak is highly overstated. It only takes a noticeable amount of storage if you only use a couple of flatpaks, cause all the dependencies are used for a single package, once you start using flatpaks as the main mean of installing "applications", the space required start to decrease because the dependencies are shared between multiple apps