No, I stand by the idea that this trilogy of episodes is meant to be a retelling of the prophecy of the Chosen One, with symbols and story standing in for a direct text.
It could be that, too, but the purpose within the story is to give Anakin a motive to dabble in the Dark Side later on, and frak everything up because of it, in a way that doesn't require him to be stupid/fearful/weak/evil/psychologically messed up. The motive is consistent with the character so far in TCW (duty bound, heroic, concerned for the welfare of others, reasonably intelligent and psychologically stable) and with Vader as well (certainly not fearful or stupid, very self-confident, willing to take risks, cognizant of the extreme power of the Force). Everything fits beautifully now.
The idea of Mortis as a microcosm of the galactic balance Anakin must seek isn't a metaphor - it serves a literal purpose in the story, to show Anakin and the audience what "balancing the Force" looks like. You kill everyone on both sides! Wonderful.

Well there are probably nicer ways of doing the same thing. But until now, there was a lot of debate in this thread over what "balancing the Force" means, so the writers were right to assume that the audience needs it spelled out for them.
First off, this anthropomorphic assumption that it "wants" anything, that it functions like a conscious organism.
The Father mentioned that the Force has a will. Maybe it is a conscious organism to more of a degree than we've assumed.
What I would have liked was a reason beyond "I NEED PADME" and self-delusion about the Jedi for why he went dark side. I don't feel like I got it. I still look at him as a someone who decided his personal issues were worth damning the entire galaxy.
We haven't gotten the full story yet. All we know so far is that Anakin now believes he is the Chosen One, and it somehow involves balancing the Force, which involves being able to control both the Light and Dark Sides, and it's incredibly important that he get it right. Not balancing the Force means bad things continue to happen and will probably get worse.
So what is it that Anakin is supposed to
do? I don't know. He doesn't know. He probably emerges from this episode more confused and stressed out than ever. Events need to develop more before he understands what the next step is.
There's an evolution ahead that takes him from his current mindset - gotta hang onto the Light Side, avoid the Dark Side at all costs, bad and scary!!! - to a mindset that calmly regards Light and Dark as both mere tools that can be used together to bring peace to the galaxy. There's no reason to fear the Dark Side if it's a tool that's fully under your control.
Anakin is a very long way from that point. Right now, he doesn't even know how to get to that point. He doesn't yet know that his efforts to get to that point is what's going to doom him. But his motive is no longer about Padme. The chaos of the Clone Wars alone would be enough to motivate him. And he's never been depicted as psychologically unstable like in the PT, so that motive has never been in TCW.
He's a regular mortal guy trying to do godlike things - rise above the mortal level, give up all human ties, and either become some kind of remote eternal arbiter of the ongoing conflict between Light and Dark, or just slaughter everyone who could be involved in that conflict, Jedi and Sith alike.
It's not surprising that neither alternative seems palatable to him, and he tries something different. His actions in ROTS don't really make much sense in terms of actively trying "something different" - he just slaughters the Jedi and then sorta forgets about killing Palps, too - but I'm sure the writers could figure out some kind of strategy for Anakin to try, that doesn't depend on Palps leading him around by the nose. The strategy will fail, but let's see him really come up with something innovative, based on what he's learned on Mortis.
Luke represents a new generation of Jedi. He wasn't raised from childhood with Jedi doctrines and traditions, and so maybe he isn't as ossified and limited as the previous generations of Jedi.
Luke is a Jedi, so he inherently unbalances the Force by being a Jedi or just by existing. If he resurrects the Jedi, he's just asking for the Sith to come back into being, because that's how the Force works.
The Force wants balance. People want imbalance (their side to win). That tragedy is the whole story of
Star Wars.