I understand that much. Sol with all his fulcrums is certainly invincible by definition. I'd still like him to have some sort of apocalyptic Quetzalcoatl form as a dramatic backup, though. I love me a good airship, but Dirigible Engine Daystar isn't exactly the way I'd have handled it.
That's merely jumping to extremes. Sol is definitively the very incarnation of Virtue, for the Dragon could not give less than his very best in order to pass into existence. He, for the first and final time, created something of lasting value. That doesn't mean he cannot suppress his Virtues, but having suppressed Virtues for several hundred years is downright out of the question. I don't play Sol as a Virtue-bot - I actually play him as an even better puppetmaster than Kejak - but that's a story for another time.
It's a matter of proper guidelines, really. "This is Ligier when he's messing around. He's much more powerful when serious but can be fought to a standstill by a single Elder Sidereal." "Here are a few ideas for the Emissary; pick whichever one you like best or make your own." I don't like the whole "behold the Most High" route that was taken in Glories. It makes Sol lesser; it removes the fear of the unknown that's crucial to these sorts of encounters.
What I dislike is that it's both inconsistent and continues to drive the Solaroid power creep. It devalues everything that has gone before. Sol can solo a Primordial, but despite needing several hundred Exalts to fell a titan, a mere circle can down Sol? What is this, Rock-Paper-Scissors?
My problem is that of the raksha; by codifying that story, you're limiting it. Everyone knows now that if Sol goes down, you can have a Sid replace him. Gone are the quests to consult with the Maidens or to demand Malfeas crown a new King of the Gods or for a Solar to rise by dint of his own heroic spirit. Sure, every ST can do such in his own game, but players are more likely to balk at him changing the rules than for him to have made up the rules wholesale. Rules exist to encourage good games, yet this one does the opposite.
I don't have so much of a problem with Elders downing Sol. After all, Exalts weren't supposed to surpass E5; such a circle is truly the best of the best. Glory to the Most High can die in a fire, though.