A4,
You don't just get out and stop on a boat.
Fact is, there is really nothing terribly special or advanced with regards vacuum bagged/baked/pre preg composite structures anymore and there hasn't been for at least 20 years.
Repairs are simple, straightforward and will last many years in service.
Boats are an excellent representation of how well composites do, an 8psi differential is a relatively simple load to deal with- it's spread evenly over the entire structure.
Modern racing yachts have enormous high stress point loads entering the structure, like tension from chainplates, compression from masts and flexural loads from keels and appendages. The loads on large racing yachts would be as large as the loads on an airliner and peak loads I'm sure would be much higher. These yachts get extensively damaged quite frequently and repaired just as often.
But it's OK to not know much about a subject and dismiss what you think you know as all you need to know.