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?
Ignis Divine would massacre certain Primordials without the aegis. Any non martially concept Primordial would probably be slaughtered and ones like The Ebon Dragon would get slaughtered even easier. The Exalts during the Primordial Wars were new, more than likely relatively low Essence, and not just fighting a Titan. But fighting loyal spirits, Primordials, devas, first circle races, other engineered races,etc. There's a reason it was Solars+Lunars+Sidereals+Dragonblooded and not just Solars.

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.
Nothing says Exalts were not supposed to surpass Essence 5.