Oh dear, we do not want this thread to devolve into THAT debate. Here is a summary of the arguments so far, so we can get ahead of the game:
PRO 5 minute: You get notifications on your phone well prior to charging being done, plenty of time to wrap up dinner or whatever and get back to your car before getting fees. If you don't have a smartphone or signal, the car displays an estimate that will get you back pretty close to the right time. If you get delayed, just adjust the slider to 100% from your phone and gain another 20 minutes to let the car get to 100%. 5 minutes is plenty of time and doesn't hold up the next guy in line at the SC too long unlike 10 or 15 or X minutes - no one wants to sit in line for 15 minutes looking at empty cars waiting for owners to come back while on a trip.
CON 5 minute: Supercharging time predictions are inaccurate especially if you are sharing a charge spot, so you can get surprised by when your car is done charging. People have kids, etc, so getting the whole family back to a car before its done charging is challenging. Some superchargers are far away from good restaurants so you have to walk a long ways. Not worrying about when your car finished charging and doing fun stuff while you waited like eating at a nice restaurant was part of the carefree Tesla road trip experience that is now gone. Actual lines are rare except at particular superchargers, so Tesla should allow 10, 15 or X minutes grace instead.
I just saved about 10 pages of discussions, so you can thank me later.