A lot of builders use either epoxy or vinylester resins now. But there are thousands of boats built in the 70's and 80's before epoxy was as common and when less polyester issues existed or were commonly known about.
A thin barrier coat of epoxy or a few layers of vinylester are common, but very few production boat builders use epoxy as the primary resin in hull and deck construction. (There are some rare exceptions such as Hanse)
Epoxy has superior properties, not only in water absorption, but strength, mico cracking etc.
Why more expensive yachts, such as HR, are not usually constructed out of superior materials is a mystery to me.