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Legal reasons; check the latest versions of the PAL courses. If you think policies about airsoft are anal, those about real guns are worse.
The (real) pistol must be; trigger-locked, magazine removed, ammo removed from magazine, magazine stored in the same locked container as the handgun (but not in it), ammo stored elsewhere.
So it's partly the laws (for simplicity) and mostly the policies. Seems that every time something is said here, a full novel must be written.
Mechanical reasons; GBB mags are not made to the same standards as real guns. Fact.
Physics; depending on how long you keep a GBB mag loaded and (fully) charged, the weather does matter. If the temperature is hot, like in Florida, you DO increase the internal pressure of the magazine. The lower quality spring compressed by the BBs will, over time, become weaker. Fact.
That's as simple as it gets. Now the only thing anyone has to decide is if they care to follow simple maintenance procedures or not.
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