If the boat was properly repaired, it shouldn't be a problem in my opinion. Unless you had a lousy surveyor.
Boats aren't cars.
I'm getting tired of the comparison of boats to cars, boatfax vs carfax.
You are dealing with two different animals.
If you repair a mobile home properly, it's still a mobile home with a certain lifespan. If you repair a house properly, it's still a house - but has a longer lifespan.
Two different animals, both built with different purposes for their lifespan.