Because it's all fanwankery.
Fanboys on either side (Trek or Wars) will go on and on with useless data about how Star Destroyer A might eliminate Constitution class B, or Galaxy Class X might obliterate Death Star Y. I've even done it...and frankly, I find it hilarious.
Fanboys have to justify their fandom with bull****. It is so with Star Trek. It is so with Star Wars... it is so with pretty much all fandoms.
It is so.