Well, I don't know what you consider an "issue" but when your car battery gets drained from 12.7V to 11.9v over the course of 6-9months on a new battery, I consider that an issue. Does the car crank over at 11.9V? Sure but in that condition, it doesn't have much long to live and it's very hard on the alternator to drive with a severely discharged battery.
How much life do you get out of your batteries before you replace them? Basically, with my pushbutton start vehicles, I have to check the battery voltage once a month otherwise the batteries go bad within a year. I drive probably 5K miles or less per year.