I don't know about everyone else... /sarcasm/
but my first free and unlocked characters were Light Side... the Dark Side characters came a little later.
No need to fret, they will release a Dark Side TB in the future. And for the (I'm guessing/speculating this figure) 25% of the player base that focused on Dark Side, are the ones upset that first TB is LS.
IF YOU were the developer, you would target the largest audience for success initially, i.e. the other 75% of the playerbase that has strong LS roster. Hence it's less impactful to upset 25% instead of the 75%.
Once both LS and DS TB are in full effect this will be a non-issue. And the same for new players who won't have a bias that they expect the game to conform to their imposed character focus. Also, imagine the uproar from the 75% about how the required DS take much longer to farm than most of the LS. Everyone would suffer the less rewards and much longer ramp up time to be prepared for a DS TB.
