You sir are wrong!
Disciplines are exactly that same thing, only difference is that showing us "the path" our abilities are gained with levels give you the impression it's not a straight-forward "progression". You can't deviate from the path the devs created.
Also the more abilities is a illusion as well, because of the level cap raise. There are new abilities at 56,57,59, two of which are passives and one active that REPLACES Lightning Strike. It's not really more, is it?
As for the HYBRIDS? They are dead. I asked, they clearly said it. You wont be able to use Death Field as lightning sorc. Period. You are forced to use Thundering Blast, which is utter "sith" compared to DF-long cd, long cast time and single target not that much of a damage). Didn't see cd removal for Force Lightning on the utility tooltips either. So no more playing it the way we like for most of us. The Utility points are just "fine tuning" options without much impact on play style(except the cast-while-moving one).
Now I get that it's a lot to keep all the hybrids in check etc. But Bioware took away our favourite builds without even giving Dual Spec and Gear Manager in return. REALLY BW? It's on your priority list for a while now? I guess making another pair of the same pants for CM was more important.
But ok I get that. I also get that this change is mainly for new players and altoholics to feel more powerful early on. And it's cool, cause I am an altoholic. But to make us click through all of that stuff each time we respec? WoW, Thats Lazy.
I have a solution though for making both: hybrid fans and devs happy. Let us choose one of the other discipline's core ability as a Utility. So as Lightning sorc lets say a choice between Death Field and Dark Infusion(with Chain Lightning as a Lightning Disc core ability). At the cost of some other important thing, like say that cast-while-moving perk(or some high dmg utility), so we can choose between higher dps and more aoe. Not that much more work for devs and we still can have some choice on how to play.