None of us here work for Adobe and we can't speculate what goes on in Adobe's mind(s).
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You really haven't given us much to respond to. The project settings for using VOBs as your source video are very different from those for a project composed of .mts video. And I wouldn't even recommend you're using WMVs as your source video. You've likely got a number of issues going on at the same time, then. Without some more focused troubleshooting I'm not anyone can help you.
Still, your issues seem to be with Adobe, so I'd start by contacting them rather than posting complaints about them to a user to user forum.
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I have never had any problem, when Importing files from my NAS, but found early on, that it was too slow a process to use and edit effectively. Same for other mapped networked drives. After those initial tests, I just altered my workflow. I still use my NAS to archive my Assets, but will Copy those to my "media drive" (my D:\ on my system). My Project files are on my E:\ drive, and only my OS and programs are on C:\. Note: those are all physical HDD's, and NOT partitions. That layout works 100% for me. In my case, it was not a inability to use the NAS, or mapped networked drives (for Assets ONLY), but the speed of the gigabit (dual in my case) network being too slow for me to edit comfortably.
Premiere (both PrPro and PrE) work best with at least two physical HDD's, and even better with three.
Where Premiere has issues with networked drives will usually be where one has mapped My Documents to a networked drive, or where the user has located the working files (Scratch Disks) to a networked HDD. That situation can create issues.
I have never encountered any "Importer" error messages, and really do not recall seeing others with that issue, so cannot help there.
Good luck, and wish that I had more to offer.