BMW Motorrad is based in Munich and not Berlin. Anyways, why does it matter where BMW keeps its service records? Things are indeed pretty tightly controlled by BMW Munich: but that's OK, it keeps the cowboys out.

What does happen is that the main electronic parts like the ECU's and the Instrument module are keyed to your serial number and you cannot swap parts from bike to bike yourself: you have to buy through the dealer/BMW. So that means if those fail it's a lot of $$$$. But that's the same for most modern cars now anyways. And you don't get these components failing very much, and if so, will likely fail whilst on warranty if it's on warranty if it's a manufacturing defect. If you have a big crash, then it's not that expensive to cover the bike with insurance.

But you can do about 99% of everything else yourself with a reasonable set of tools: and that includes a GS-911 and a multi-meter.

A GS-911 is not for just "resetting fault codes". You can read just about all the sensors on the bike, and record it real-time while the bike is running. So you can see if it's running OK. Do preventative maintenance. I have an HP2 Enduro, so my ABS faults are minimal (I don't have ABS...:-} but ABS is a very common issue on GS-s, and the GS-911 helps you trouble shoot these. Even if you don't pick up a wrench, you can see what's causing a problem and save the mechanic a few hours trying to find the issue (and save you $$$).

A BMW is a pretty simple bike: even the more recent ones. If you read the manual, have some tools and use common sense you can solve many issues yourself. The really complex stuff is too much hassle for the dealer to fix in any case: they'll just pull the part and put a new one in.