Your comments are certainly valid. Seems like many of the items you suggested could be added fairly easily - inspection hatches, lift pump, and such. Not everyone would agrees with your thoughts on tanks especially with boats smaller than yours. I'm glad to have just one fuel tank and one water tank on Shawnee (IP380). That's enough to take care of. For passages I keep 3 jerry jugs on board for extra fuel, otherwise I just rely on one tank (with lots of spare Racor filters). For water, maybe I've just been lucky with one tank and a water maker. I think Bob Johnson didn't bother with replacement access for items he thought would last the life of the boat (like tanks). Unfortunately waste tanks didn't last that long on most boats. We easily replaced our water heater after 20 years, not because it needed it, but just because it was 20 years old.
Maybe Benetaus need more maintenance