Do you think there is a remote possibility that the NA actually took the weight of the fly bridge into account when the boat was designed? And, as designed it is quite stable? I have no idea how many fly bridge boats exist, but I do know that if they were inherently dangerous or less than seaworthy there would not be many of them around.
From my perspective, and this is just me personally and not a critique of anyone else's preferences, I couldn't imagine boating from the inside all the time. I love the view, the sounds, and the breeze from the top. However, as I said, that's me.
I have two cars. One is a two-door coupe and the other is a convertible. Guess which I drive when the weather is beautiful (if I can pry it out of my wife's hands)? Is the convertible inherently more dangerous than the coupe? Perhaps, however we assume the risk for the enjoyment.
We take a risk just getting out of bed in the morning.