My 5 clothy group does have the exact same professions for exactly the same reasons and I never wanted to change any of them. Everyone is a tailor for the craftable epics and I wanted a jeweler and a alch for the transmutes. I am not sure if the jeweler is necessary but i just wanted one .
I did make the mistake not to level the gathering professions till i was in my fifties and had to spend a couple of hours to catch up - if I had to do it again i whould level the gathering proffessions while leveling up.

Bunny