I'm just speculating but I'd guess that it is a problem with that model and many years of that model. I'm sure that many don't even recognize the issue at all and many it takes years to notice (much like a few on here), and some never will. A lot of Moomba owners are in a freezing climate and if it were an issue causing "structural integrity" then I would suggest it'd be more of an SC concern?

I personally wouldn't care for it as it'd be the cause of some musty smell at a minimum. Glad to know it's an issue as I might trade for an LSV model some day. This is something I'll look for on my next boat whatever the brand.

Point being............probably more a nuisance more than anything