Summer, NO.
Winter, yeah, I'll wait.
If it's cold and you open in a warm environment there will be condensation in seconds. If the finish is porous and/or the wood is not sufficiently cured (comes from a giant conglomerate, for example, and there's another thread about how they need to manufacture more quickly…just saying) then the moisture trapped near the surface of the wood can fog under the finish.
Especially common with thin nitro.
I have seen it happen when I worked at an instrument company. It took about 5 seconds to ruin a custom Hamer. Glad it wasn't me lol.
If it's cold, wait. If it's warm or not too extreme I wouldn't worry about it.
But the warning is accurate and in some cases this time of year you can wreck the finish.
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