It always seems to be implied that a boat of 10 x stronger (in tension) material is 10x stronger. You boat/mast whatever does not fail in tension. That is, in laymans terms, the skin does not pull apart (on the leeward side of the hull,say) but rather buckle on the compressed side. As such, the method of spacing the layers (foam) is very important.
It is a bit like trying to push things around with ever stronger string!
This is why wood stays a firm favorite with everyone except the quantity manufacturers, and gee wizz crowd.
Honeycomb cores (wood cells?) (and other duplications of nature) are the key to this resistance to buckling.