Thats another myth. The slow update problem can't be swept under a rug since its quite widespread. Theres nothing wrong with the pc's that I maintain in my family and the update process still hangs and fails which could take over an hour without completing a single update.
The recent 1511 update could be in part meant to help resolve this slow update issue and bloated disk space requirement by keeping Win10 installations fresh with regular large 1511 type updates by clearing out the update history, and not let piles of updates with complex interdepencies clog up the update process.
How is it a "myth?" I've used windows update on hundreds of fresh installed Windows 7 machines, the last one I did this on was *yesterday*. Checked and found the updates within a reasonable timeframe.
Nobody is saying that Windows Update works perfectly 100% of the time, but there are literally *thousands* of reasons why Windows Update might hang on any given system. It can't all be lumped together as one problem because it's simply not, and it definitely isn't some grand conspiracy by Microsoft to get people to upgrade.