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<blockquote>is it possible that moving around laptop antennas does not change the specifications drastically, because, for example, the antennas are low-power</blockquote>

The radiated power is probably not low compared to what is allowed.  Laptops with limited WiFi range don't sell well.

The limit could also be in the unintended frequencies.  Even if the main power is "low", one or more unintended frequencies might be close to the limit.

<blockquote>or because the chassis does not play a significant part in the specifications?</blockquote>

The chassis and other stuff near the antenna may very well be part of what shapes the radiation pattern.

You don't know what effect various parts of the system have without testing the result of changing things.  Simply moving a wire to bend one way instead of another can change things, especially in the unintended radiation bands.