BMW is not alone is battery issues though, other manufacturers have issues as well. They are putting more and more electronics in but the charging system hasn't really changed. This causes issues. Did BMW make some poor decisions that other companies didn't make? Sure, but they also made some decisions that are better than what others have done.

There was talk of 42-volt electrical systems in the 90's. Those obviously never materialized. in 2011 the Germans manufacturers agreed upon a 48 volt system.

A few things BMW should have done for N63 based vehicles. When you pushed the park button, the alternator should have engaged (unless that battery was already at 100%.) While a second or three would not do much for the battery system, a bit of power would have gone into it. Next, they should have activated the cooling fans to help draw air through the radiator and expel hot air out from the engine bay compartment. This should allow the cooling system that runs after the engine is turned off to run less; how much is debatable but every bit helps.

To help cool the turbos on the Ford Ecoboost 3.5l V6; after the engine is off, cooler coolant is automatically circulated through the turbo because of their setup. BMW is using electrical pumps to do it. I'm sure the BMW method is more effective at removing heat, but it is at the expense of the electrical system.