OK, I'll bite:
I want multiple user accounts on mobile devices
For iPad that would make sense and agree not all mobile devices such as phones...
Why not? I want a pocket PC. The power and storage to do it is certainly there.
I want more RAM in sealed/mobile devices, not the bare minimum
Bare min. means it's not enough to do x.....elaborate so we understand your problem is hardware or ****** coded software.
This has been discussed at length already. More RAM = a better, faster experience.
I want access to the file system in mobile devices
you barely get that with Android unless you root it, jailbreak iOS if you like...
Not true. My 2-year old S4 has it out of the box.
I want ease of connectivity and compatibility (as in NOT proprietary)
Even the open USB connection gets messed up by OEMs, such as Motorola telling me the USB cable is not theirs and that's why my phone wasn't charging. They refuse to support any cable that's not Motorola made.
As with anything, YMMV, but again, I use an old Blackberry charger I found lying around on my S4. So maybe both Apple
and Motorola need to get their heads out.
I want to install whichever OS version I prefer (or at least revert to the one
that came with my device)
Installing whichever OS means the Hardware maker needs to support multiple OSs and that's up to them. Reverting back to the old OS is another issue to dissect reasons.
I can install Win XP or Win 7 on pretty much any HW. At the very least, it'd be nice to revert to the OS that my device
came with, like say, iOS 6. So there is no excuse why Apple can't do that, other than the obvious forced upgrade BS.
I want portable computers with upgradeable components (RAM, HD)
upgradeable means that other things will take a hit such as weight, form, portability etc...your choice. Many other companies are already moving towards thin and locked to make cramming all components easier. People that upgrade their RAM or HD are few in statistical terms.
For a while there Apple sold cMBPs with those attributes
next to their Retina counterparts. This is not an issue of feasibility. Many other companies are moving to thin and locked
without eliminating offerings that are not. It makes sense: Don't turn ALL your portables into ultrabooks. Apple has continued to sell a cMBP by the way (the 13" MBP), without updating it. WHY???? At least bring it up to date. If they did, I'd buy that instead, without thinking twice.
I want desktop computers with upgradeable components (at least Graphics Cards, RAM, HDs)
See above + you're more likely to upgrade a computer before you worry about graphics cards unless you're a gamer for a living and that would still hold true.
I use consoles for gaming. I want my computers to have legs and not be "throwaway" devices. If I run out of HD space, I'd rather not have to buy yet another cable, another enclosure to externalize. Current processors have more than enough power to last for many years. But graphics architectures change quickly. The option to add better/more powerful cards as needed staves obsolescence, which again, Apple doesn't want. They want you to upgrade. It's a clever business mechanism. But it doesn't benefit ME.
Apple wants to turn ALL computing devices into appliances. That is their vision. I think that there may be a point where SSDs are big and cheap enough, and power will exceed the needs of users. But that will not happen for a very long time. So I'm left with the following:
Hoping that Apple gives me what I want (unlikely), which means I'll have to stay on my current hardware and wait until Windows and or Linux and OEMs gets good enough to ditch Apple entirely.
I'm already there with iOS; Android is more than sufficient for my needs, despite my desire for it to integrate as smoothly as iOS with my Macs.
Windows 10 is almost there and certainly appealing, but I prefer UNIX.