Using Classical theory in modern music gives us Neo-classical music. Using the strict ideas of each era breaks it down into different sub-genres, neo-romanticism, and neo-baroque (malmsteen is neo-baroque to me for the most part). Nothing wrong with using old ideas in new context.
There are no strict laws or recipes for music, only the laws and rules the musician makes for him or herself. (unknown)
"My whole life is a dark room...ONE BIG DARK ROOM" - a.f.i.