Wood in boats will last, if you know how to take care of them.
If you don't, it can be bad for you if you don't fix crackes or keep screws/bolts tight.
I have a 30 year old boat with wood in the decks, no soft spots at all. But I like playing with old boats. They are my hobby.
The issues with wood under fiberglass is that you don' know, or not sure when water will get under the fiberglass. Everything attached needs to be sealed and thru bolted with a backing plate and lock nuts. Screwed down items need to be sealed, and make sure you check that the screws are tight so water cannot get under the fiberglass.
If water gets under the fiberglass, it takes a long time to dry, if it does dry. If it rots, the only way to fix it is to remove the fiberglass, remove the rotten wood, replace with more wood or a composite and re-fiberglass. Not cheap.
Wood has a much better strength to weight ratio than the composites. But composites are getting better, and composites don't rot.
Boats with wood can be built in any shape or form and are much more customizable.
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