Interesting stuff but what you seem to be talking about is the "Magical Girlfriend" genre and not the "Magical Girl" genre which does admitedly have similar origins in the TV series Bewitched, although the actual content is quite different.

Also since I don't want to respond to your other post separately.
You mentioned liking Emma but have you read any of Kaoru Mori's other works? Especially her (relatively) recent Otoyomegatari is quite excellent.

Though I must say I always did preffer flashier looking manga, it's easy enough to see just by looking at my favorite mangaka, those being Araki Hirohiko (Jojo's Bizarre adventure), Kentaro Miura (Berserk, Gigantomakhia) and Tsutomu Nihei (Blame!, Knights of Sidonia, Abara)