Re: Dead Platform
"Where is the promised VPN?"
Details here: https://blogs.windows.com/windows_phone/b/windowsphone/archive/2013/07/10/making-windows-phone-an-even-better-choice-for-business.aspx?Redirected=true
That was the first time Microsoft committed to it, and they have not slipped the date so far.
"Where is some good 1st party application suite"
The vast majority of the top 100 are now on Windows Phone - and Windows Phoen has the best support of Office - a major feature for corporates of course...
"Option to un-sandbox some/all applications"
Never going to happen - it's a secure platform. You can install a corporate cert and sign / install your own apps without the Microsoft Store if you need to,
"adding a file explorer"
Already exists: http://www.windowsphone.com/en-gb/store/app/file-explorer/8d87e9b9-6e03-4585-a947-339ff038dd3b
"Installing applications outside of the store is pain in the back,"
Actually it's far simpler than any other mobile platform that hasn't been rooted - and is fully automated via SCCM.
"not to mention the necessity to have a live.com account to use the smartphone features"
No different from needing a Borg Mail account for the Borg Store, and similar for Apple / Blackberry...
"which immediately starts uploading all your contacts, calendar and all that to Microsoft's power-of-the-cloud servers"
That can be disabled whilst you adjust your tin foil hat - again - no different from the other platforms above.
"The OS is trying to look like an enterprise OS"
And succeeds rather well - certainly better than the competition in this regard....
"it will take Microsoft about 5 years to make it at least as feature-rich as Android, iOS, Windows Mobile or Symbian."
I doubt it will take that long - progress has been good to date - and many early feature gaps have already been filled - WP is highly functional, efficient and very secure - it might take Microsoft a long time and a lot of money, but they will almost certainly get to the top of the pile in the end...