Ive heard that as well, but havent seen any data or empirical testing to indicate the hull is compromised.
I dont think the actual hull strength gets compromised, but the finished surfaces dont hold up.
Many manufacturers will build your boat either way and in race boat- go for it. You are going to cover it all up with vinyl stickers anyway. Who cares about cosmetic look a decade from now?
Its not expected to look great in ten years.
In a pleasure boat you buy own, make 15 years of payments ob and show off - even guys that build both will tell you if you want it to look good in ten years- go glass.
This is the info Ive been given.