The problem is, it isn’t simple. You have to inject each addon into the reserved space for MSFS. You can’t do that within the Xbox itself. That is why I have to Imagine this “Xbox” they use for testing doesn’t have its own hard drive, it probably uses a network mount to simulate a hard drive. That way from some PC, they can inject into the reserved space of the test “Xbox”. In other words, you can’t just pic that Xbox up and put it somewhere outside the network, it has no physical hard drive. You can take the Xbox out the lab, but there will be nothing to boot, it would just be a shell.
A lot has gone into making the platform as secure as possible so people don’t modify save games or add equipment or mod the game files themselves to give themselves the edge in competition. It’s terrible that people would do that if they could, but it would happen. Esports would mean nothing then. So the Xbox architecture is locked down really really tight. But people keep forgetting how secure it is, that this testing should be really easy. And it’s not. If it was easy, someone would have figured out by now how to load addons onto Xbox themselves, and it would be all over YouTube.