The issue with class/talent trees is that in the end, the choice they give you is... Meaningless. As an example like WoW or other games with talent trees, there will always be an option that is regarded as "the best" by players, and will be the only one used because its benefits are simply too good. All of the rest will be disregarded as bad or useless (which let's be honest is the case with 75% of anything in a talent tree anyway). In swtor, there was also a multi-spec system, with each class having three spec possible. One "sustained" dps, the other "burst" dps, and the last being either tank, heal or another dps spec. For each and every class there was, you would be certain that one spec was always the one nobody used because it was simply horrible. Or worst case, one spec was used because it was either too strong or the least bad of the three available.

The only thing we have here looking like talent trees is the fact that you can play whatever job you want on the same character. If you want more support-based tanking then you play Paladin. If you want a more shield-based healer you play scholar. If you like being the ranged with many buffs you play dancer or bard.

And I don't know if you've actually played ultimates or even savage raiding but on some fights, if your whole group isn't helping your healers or tanks then you'll end up having a really bad time. E4S at the time was really rough on some healer checks (tumults at the end of the fights were really challenging to heal through) and you would definitely notice a difference if you had a Paladin throwing a Divine Veil or a Monk using Mantra in the lot. The same goes for ultimate, and is actually used by some groups who do stuff like "one healer clear runs" on Alexander. You take a bard because it's stupid strong with double dot, and it can cleanse himself as well, allowing for a much easier time for the healer.

Multi-spec or talent trees aren't the way to go for each class. They give devs an extra work charge to balance it, and since they never end up balanced anyway, the choice they seem to give is almost never a real choice, as there will always be a better combinations above all the others.

That's my two cents on the subject !