The Morality starting values... whether it's adjusted by +/-20 or +/-21 doesn't in the larger picture matter. Sure, you start out as either a paragon of the light side or consumed by the dark side with this recent change, rather than on the cusp of either falling or becoming a lightsider. My point is that both provide good roleplaying opportunities for either redemption, falling, continuing on the path, or striving towards a more balanced and harmonious midway. If you start out on the verge of falling, that's cool, but if you start out as already fallen, but striving towards redemption or that grey middle way... that's easily as cool. The same with the almost paragon vs paragon situation, being almost paragon is cool, there's the work towards the goodiestuff, to become this paragon, but then, having already become a paragon can provide a different set of challenges, remaining paragon, resisting the temptations that would have larger consequences now, or to play into this, a lightsider that is "actively" falling from grace, becoming corrupted, having lost his/her/its way... that makes the fall that much longer, possible to be roleplayed properly.
Now, sure the game mechanical argument is one thing, there's a benefit to be starting off as either, but you do so at the expense of extra resources (XP and/or credits). Still, if this is the only part that provides incentives for playing and making choices, I'd say, in my now common place elitist and normative manner: You're doing it wrong. To borrow, or at least be somewhat inspired from mr. Wick's recent blog post: If the reason for you playing roleplaying game is levelling up, customising gear and basically focus on the numbers on the sheet, you're doing it wrong, you could be playing chess instead (I'm not saying that as a bad thing, chess is a good board game). I'm not saying this part of the game isn't important or at least enjoyable, but I think that the reason for playing roleplaying games should be first and foremost to: Roleplaying; create stories with others; suspend disbelief and immerse oneself in a universe and story driven by a collaborative effort. Your character is of course important here, but again, the stats themselves are secondary to the actual character, they don't define him/her/it, it's the character that define the rest. At least I think it should be. Choices should be made based on the character, not game mechanical benefits and maximisation. I'm not saying one should avoid that at all costs, but I'm saying if it all boils down to tweaking and specialising as we see it in... oh, a certain few MMOs, then it's not the roleplaying and story-creation the game is about anymore, at least no necessarily , it becomes about having the best set and combination of numbers and rule changing extras (i.e. talents, force powers, etc).
Whether or not one of the rules is more "Star Wars" than the other doesn't factor into this, it's a non-argument, because as has been established numerous times on this forum (and elsewhere), Star Wars is very different for different people. No one (on these forums at the very least) has the authority of definition. Arguably no one has. Sure, there's the whole jurisprudence of it, but let's ignore that as it plays little into this: What I think is Star Wars, what Donovan Morningfire thinks is Star Wars, or DarthGM, Angelicdoctor, Rakaydos, Awayputurwpn or Zar thinks is Star Wars is mostly only relevant to each one of us, and our gaming groups. We all have one thing in common: Star Wars is a resource to us, it's something we actively use to create our own stories and variant of that universe as it fits with our vision and desires of how it should be, at least in our games. Perhaps there are basic premisses of what constitutes "Star Wars" but we are not in the position, when discussing a game and rules mechanics, to use (or able really) that as an argument for some position or another, it becomes a variant of argument from authority and that's just silly and pointless, or to be more precise: a logical fallacy. So, I'm not saying we shouldn't use our own vision of Star Wars as a basis for our position, but to use it as an argument (place-holder really) and a blanket generalisation:"... because Star Wars" is, when it all boils down to it (whether you're a fan of only one film or all of Legends) meaningless and a non-argument, it's perhaps an opinion (and important to you and your games), but opinions are not arguments and are -I'm going normative now- of lesser value and validity in any discussion, but particularly in a discussion on game mechanics and rules. So, keep your opinions and perspective, but avoid trying to use "... because Star Wars"-opinions as an argument place holder (I know I've done this exact thing too), find proper arguments, opinions matter mostly only to oneself, arguments provide a social opportunity to discuss, affect and be affected by others on subjects one cares about (to varying degrees), and they could matter for other people too.
Take it easy, amigo. I was just offering my opinion, a dissenting one, but an opinion nonetheless. That is what this forum is for, no? And this based on the precedent set by the six films in their entirety. Agree with me? That's great. No? Then it is no skin off my nose.