The question of the OP is also not very clear to my and the reply on the offered help is also not one which I like.
Anyhow I still will give it a try.
We get regular posts of people who have problems when they want to roll back using the LSRT or WSRT because the phone is not recognized. Keep trying, changing the USB cable, changing the used USB port or changing the used PC often helps.
So in that sense the "connectivity to a laptop/PC" is not 100% perfect but hard to say that this is WP 8.1 related or hardware or whatever.
You can not use and USB connection to tether an internet connection. So the connectivity for that is indeed 0.
If you have to copy large amount's of data between your PC and phone it will take a "long" time because it is a USB2 connection and not a USB3. But this is obvious hardware related.
If you mean the use of syncing your phones data with your PC then we regular get complains that Zune was much better. So a "better? sync software could be helpful.
If you mean that you only can make a backup from your apps and settings to the cloud and not to your PC then you may have a point.
If you mean that you can not use your PC to see text messages (or copy) and sent messages from your PC or something like that you also may have a point.
If you mean that if you copy stuff from your phone to your PC and the copy fails I never notices it.
If all above is not at all what your question is about then I also don't know how to help.