I had the same mindset when I first got the P2V+. I had 5x OEM DJI P2 batteries that went to ****. The more batteries you have, the more you rotate, the less cycles per battery. With a 3 month warranty on P2 batteries, they all low cycles and all decided to fail after the warranty lapsed. None of the batteries exceeded the 50 cycle let alone reach the 300 cycles DJI advertised.
I moved to after market Venoms with 1 year warranty and they work much better and don't go into early auto landing.
Just because they make drones, does not mean they make the best batteries.
GM makes cars but do they supply you with the best tyres? Give it some time and the battery manufacturers will make better batteries.
I just hope the firmwares don't lock aftermarket batteries.