If you 'have a leg to stand on' other than the raw expression of power you are doing it wrong.
I don't want to make this a fight, but that's exactly what I meant. As in, Junior has the ability to openly defy his parents because all that heroic mass murder and assorted "glorious deeds" have beefed him to the point where if they dare object, Junior can and will smash all their organs into paste.
Like, I've written up two Solars for a quest. One of them is a mixture between Walter White and a SWLIHN cultist, and the other is literally Shou Tucker. "Greatness does not mean goodness" is kind of a major feature of how I approach Exalts.
Let us assume every Dragonblooded wants to have powerful children to pass their legacy to, because duh. This means every Dragonblooded is encouraged, nay mandated, to go out being a heroic badass.
Unless you define "heroic" to be broader than "PUNCH FACES ERRYDAY", which in retrospect I failed to make clear. Apologies. However...
You won't get craven Dragonblooded...
Unless they learn to be silver-tongued politicians who adroitly bend the truth to make their cowardice seem like wisdom, or embed themselves in the Realm's bureaucratic structure and set about trying to make a mark on the world by revamping tax collection methods*, or become master artisans or craftsmen or architects or courtiers or fashionistas or...
Again, Dragonblooded politicians. However, may I also point out that a spymaster or assassin or thief could totally get away with being shifty?
This one's a bit trickier. However, you have to realize that a dynasty needs to have, well, a secure heir. If the first son dies while out trying to boost his Breeding, then the family needs to have somebody set up to take his place or else deal with a potential internal war of succession. Likewise, a Dragonblood who already gets high Breeding from birth has much less incentive to exert himself, and may well have parents who decide it's better to have a homebody in the line to act as a broodmare/breeding stud. Alternatively, you can have Dynasts who only pay lip service to the whole "heroic" thing and just try to stay out of sight and pursue their own pleasure, hoping their siblings' deeds will provide a nice big shadow to hide in.
You're not going to have an Empire of decadent dilletantes willing to sit on their ancestors great deeds and squander the wealth of the world; you're going to get active Brotherhoods chasing glory and virtue all over the world.
...
And that's bad? Seriously, does Exalted rely on stories of hedonistic Terrestrial
hikkikomori, or something? How does a more active Realm damage the gameline?
Also, if it's that big a problem for you, then how about arguing that letting large numbers of young Dynasts spread too far afield could ultimately weaken the Realm, as unsupervised youngsters did stupid things & some Dynasts chose to try and sever ties in favor of trying to establish their own dominions out in the boonies. Eventually, the Empress moved to rein in such unrestrained expansion a few centuries back, and now that she's gone you have the Realm internally bubbling with Young Turks who want to either prove their homeland's still got teeth or sod all this for a game of soldiers, while their elders bicker over how to proceed now that a major component of their nation has vanished.
Rather than the Empire collapsing inward in the bid for the throne all the great powers will be sending their scions out into the world to hutn down all these anathema because they want to prove they have the best candidates for fostering the next generation of heroes and thus the best shot at the throne.
Again, how is this different from the Wyld Hunt as-is?
Further it also destroys the First Age. *etc.*
First off, I neither know nor care about these "Golden Children": all the First Age needs to be is an era of unprecedented infrastructure and technological achievement, backed by a well-managed Celestial Bureaucracy and the oversight of the Deliberative. Then it goes rotten because Great Curse, Exalts are still human, Great =/= Good, etc, and eventually the Sidereals commit the Second Usurpation and the Shogunate begins.
Why did the Terrestrials turn on their masters? Envy, greed, anger over mistreatment, disagreements over how things should be run, powerful personalities clashing. As for the idea of Solars wanting children with power akin to theirs, well Terrestrials are inferior, are they not?
"What foolishness, to claim that Gaea's impure spawn can match the glory of the Sun's Chosen!"
you just have to make a exception for Celestials here. After all, GoD specifically says that the terrible heroism of Solars and Lunars is too potent to be transmited by blood.
Also, this.
* Not necessarily to make it better, mind, just so that when it's been changed they emerge as the primary force behind that change.