At this point only small tweaks are being made to tech trees....If none of the tech trees could share data I think we'd go crazy (or at least cut it down from 12 trees).
In my opinion the tech trees are very good as they are now. There has to be at least some comparability to the tech trees of each race. Otherwise you would have to learn a completely new game with each race. I find it very satisfying to see the tree and think "Okay, that tech does something like the old tech in a bit different way, so i have to adjust my play style to this." Your style of play does not get completely useless when you see the individual tree, but you have also a challenge to adjust your gameplay to it, because it actually is a bit different. I do trust in your skills of making a good game, so i just lean back and enjoy whats coming. What i have seen so far does more than meet my expectations.
The current version does good in giving a very different feeling to each race. I just read that article and could not really believe that. If the reviewer is disappointed at the end, because he does still see the similarities between the races (with some techs only renamed, others changed a bit and a few new bonus techs), i think he is just stupid and has no idea what it actually does mean to make a good game and get it balanced well. Twilight already now offers more than almost any other expansion available for other games, so there is no need to complain in my opinion. Give us, what we see now plus a few extras that make it perfect and we all will be very happy, i guess.

By the way - as i can see it, there will be lots of possibilities with the editors, so if the reviewer doent like the way the game is, he might as well make it the way he wants it to be by himself ^^