^ Could your relaxation come from the fact that you feel no pressure to perform with Brits but try really hard with axis? That's what I tend to do.
I know what you mean but probably not. Imo as Axis it is simply way more crucial to make mistakes. As Allied I know that even if I lose a squad, I'm not clearly falling behind. When playing as Ostheer, losing a Grensquad, especially in the early game is almost a death sentence, especially when playing against an aggressive opponent.
I don't put myself in pressure when playing as Axis. I know that I will always be around Rank 300 - 700. If I manage to climb the ladder, it usually means that I'm falling down again. That's how it goes if you don't "train" yourself to become better. I simply find it way more frustrating as Axis because you have to babysit your troops way more. Your troops are somehow more easily wiped in single rounds whereas as Brits I mostly am losing squads because I hit retreat to late or was somewhere else on the map.
As Germans you get Vet 3 wipes by mortar rounds, hidden Bofors and cannot do anything against it. That sucks. In the games as Brits I often thought "Wow, if I was that Ostheer player, I would be so pissed right now", because a Vet 0 mortar simply one shotted a squad. I did not do anything, no micro, no skill, it was just a mortar I build, killing a gren squad in green cover, fighting my Infantry Section that was down to 2 men. The grens were clearly winning and I would have retreated a few seconds after. That is bad game design and shouldn't happen. Also when crushing their troops with the Cromwell. I could continue this list forever.
Losing squads as Brits feels like deserved whereas losing squads as Germans is way more often bad luck and cheese, simply because it is pretty often not your obvious fault. If I lose a whole squad to a rifle nade it is well played from my opponent, but losing a 240MP + 60 Mun full health Vet 3 Gren Squad to a Vet 0 mortar round is bullshit and everything but deserved.