How the heck would I know why yours works and mine doesn't? Quicken 2016 and Quicken 2017 (for Windows) both exhibited the exact same problem. So one man’s “disaster” is another man’s functioning as advertised financial app I suppose? Certainly Quicken 2017 is not the be all, end all of banking apps but it isn’t the piece of crap you describe either. As the banks and credit card companies change their security requirements for login it’s a simple matter to update those requirements in Q2017.
I use the auto-reconciliation feature all the time. Bank checking and saving accounts, credit cards, My Stifel Nicolaus IRA and investment accounts all update regularly without issue. Then explain why my “online banking interface” is operating perfectly with quicken 2017.