Being a software developer myself, I can understand the "end of summer" response. They could have scheduled updates planned, and some bugs are harder to find than others. Granted, if it worked in version x, and they broke it in version y, they can easily do a diff on the changes, and hopefully make a change back, but, sometimes it isn't that easy. Either that or they have no clue how to make it work now, or they have everyone on Sync 4, and Sync 3 gets tid bits of time.
I myself just use my smart phone for maps anyway, since it shows a lot better details and changes in roads are updated more often since google maps is updated at google continuously, and the Sync is at best months behind, and believe me, roads change within months. Changes in roads around the McGhee Tyson airport, the map on the explorer would have taken me into a field for a mile or two, and stayed that way even after the last two updates, but google maps was up to date in short order. And I really don't like the android link mapping, leaves a LOT of info out, can't search by half the stuff you can find directly on the phone maps.
All of the above, just my opinion, and opinions vary, we all have them
