I think guitars do become looser and drier over time. Some call that "waking up."
However, "waking up" after playing it a few minutes is, IMO, due more to one's fingers/arm loosening up, adjusting to what you are hearing, and figuring out how best to play the guitar at that particular time. Finger style during a very humid period, is quite likely to sound more muffled than usual. So, I use more nail, or a flat pick. Similarly, during dry months, the guitar may be a little more bright.
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