Does this mean MB Sweden requires all service to be performed by the dealer? If not, how could they determine if there was a gap in service. What really makes no sense is that the A2 service doesn't seem to include any HV battery related items.

Service needs to be performed by an "Authorized" MB workshop. Thus far, I have been staying with the MB dealer I bought the car from.
I believe I have read that A2 does include checking HV battery connections, for example.

I believe for Mercedes-Benz to deny a battery warranty claim they would have to prove that the one week delay in performing the A2 service caused the failure. And since the dealer did not detect any problems with the HV battery when the service was performed I don't think MB has a good case for invalidating the warranty.

This matter has been resolved and MB has informed me that my HV battery warranty is still valid. A sigh of relief...

In the USA, that would be true (Magnuson-Moss Warranty Act?). Not sure if the same logic would apply to Swedish cars/owners.

Correct. this is only a US thing and is the overarching law regarding denial of warranty and limits of liability. BUT im not an EQ owner and have not read the manual, though the manual does not supersede the law...also not a lawyer but after dealing with enough technical law in my life, Magnuson is one to learn of youre a car person.

Brake fluid flush is probably the one thing you should not skip. Brake fluid is hydrophilic and will pull water out of the air over time, especially the DOT-4 used in the EQ series, so needs to be replaced periodically. I suspect the issue is more serious with EVs as the friction brakes are not used much so the fluid does not heat to drive off water that has accumulated. Honestly, I think DOT-3 would have been a better choice; while it does not have the temperature range of DOT-4, with regenerative braking you are unlikely to ever get the friction brakes very hot. You do not want water in the brake fluid because it promotes rust of the components and can reduce brake effectiveness in heavy braking (e.g. emergency stops).

MB recommends 2 years or 20k miles whichever comes first. I have a special use case (high mileage) so it was flushed just 4 months ago during the A2 service. Does not make sense to flush it every few months. Also, you can easily test for water content in the brake fluid, using available kits, to determine if its due for a flush. I don't think your argument holds up against MB requirements, since MB themselves have recommended 2 years even if the car wasn't driven or the brakes were barely used.

I see, I was under the impression you were skipping the brake flush entirely. If you are doing it a bit more rapidly due to your conditions, and did not need it on the normal schedule, that works fine. I am concerned that people reading your post would think you can skip the flush entirely. You cannot, there are good reasons MB recommends the periodic flush.

I experienced loss of braking twice due to brake fluid water content. The second time was when I was hustling my 914 down Mt Baldy.

Oh yeah, it’s fun having the brake pedal go to the floor when you kind of want it not to. Used to bleed the brakes before every track day but still had it happen from time to time, but ‘80s-era brakes were not stellar compared to the massive discs and calipers on our cars.

I had a car where the power assist would randomly cut out one time every couple of months. I would have to press the brake pedal with everything I had to get the car to stop, and never could manage to depress the pedal much even with two feet on it when the power assist failed. Always managed to stop it in the end, but it got exciting.