I think in this case, airdrying will help to a better adhearence of the slides. Without this, I fear, the slides would go off. And this is worse than bad morphology.
In my opinion (without practical experience with prefixed frozens) I assume, that airdrying of properly fixed specimen doesn't matter, because morphology of frozens is always worse than that of the paraffin-slides.
After the IHC-procedure of FFPE-sections it should make a difference, because the tissue was heated and treated and is then more sensitive for drying-artefacts. - Just theoretical thoughts.