I very much enjoying playing this game: being both a huge star wars fan and an avid MMO gamer, thank you. But, I prefer playing solo and as I now have high level characters, I can reflect back and express my personal opinion- that there are way too many Flashpoints and Heroic Missions that require a group, which interrups my personal style of gameplay.
It's optional. Not too sure what the problem is? Are you a completionist? If so mmo is a bad genre for ya