Points well made.
I also built my stripper to be a canoe, not a coffee table, so it was in anticipation of repairs that I didn't put in any floatation bulkheads. That was just my choice; someone else may make theirs for other reasons, and have a different outcome. Whatever floats your boat... (OOoohhh,
that was bad...) I have had to do some minor repair work inside the ends, where bulkheads would have prevented me from seeing that work was needed there, so I think in the long run, it has worked out okay for me. We all make our own choices. I don't think there's any question that they add structural strength to the stem areas, I'm just not sure if the additional strength is really needed -- the stems are probably the toughest part of the boat already.
I will note that, when swamped, this boat floats with just enough of it above water to say it's still floating... not much more than the tip of the bow stem shows. It could use help it that area! When I get the sail rig on it, I'll use floatation bags for when it swims me.
So as far as strength vs weight, yes, it's a trade-off. If you're okay with a more durable, but heavier boat, build it that way, by all means! After I cracked mine up, I doubled up the layers of glass, just for that reason. It's a solo canoe, 15feet, which weighed ~50lbs when it was new; I'm not sure what it weighs now, maybe in the ~55 range?
But after that major repair job, I'm thinking wood & canvas make a better boat for rough water use than strip & glass, for the repairability. Stripping the old glass off of large areas with the heat gun was not my idea of fun. And yes, while I do still use this boat for lakes and gentle rivers with plenty of water in them, I now use a tupperware boat for rock-bouncing days. I was tired of fixing it, and had the rubber boat on order, before I cracked it up.
Those "down for repairs" days during paddling season are just another argument for having more boats!