Ok I will throw my 10 cents worth in here I've what I know.
Fist off any boat hull either made from fiberglass, cement, steel, aluminium or timber with sealed compartments will be trouble. Yes water condensation will be present in a sealed compartment. To what amount is a science project itself and there are many different theories to just how much water will be produced. Before the mathematicians and goggle experts start, real life I have seen water from sealed compartments that I couldn't believe and that's after doing a pressure test on the compartment with no loss of pressure. That is also on a aluminum hull so that rules out water retention in a timber combination.
Second, any compartment having a inspection/breathing hole is very appropriate. This relates to whether the boat is permanently in the water or out. Adding fans and whatever is just crazy.
I could go on more with this subject but in the end it all comes down to the design from the builder and if they have decided that they are going to install sealed compartments that you can't access you should find a different builder. This issue has always been a problem with production boats. It's the old story, you get what you pay for. Every boat should have access to compartments, but this is not the way unless you are getting something custom built where they look a little closer at items as such.
Having ventilation in a boat is a positive. Like someone has said it's strange how sailing vessels have inspection/ventilation ports built in, but power vessels seem to disregard this principle. The boat I am currently restoring followed the same stupid idea of sealed compartments which I have installed inspection ports. You can't beat ventilation full stop.
I will get the crash helmet on and be ready for the response.