I can agree that these are high level feats and they are supposed to be powerful, but Quicken Spell should be as well, especially since Larian increased SP cost. Without Larian's change, I hardly see Draconic Sorcerer competitive with Evoker Wizard at higher levels at nuker role - Evoker has constant, free and more powerful Careful Spell, its saving throw cantrips always deal damage, its Intelligence modifier is applied to all their Evocation spells allowing to use different elements compared to one element empowered spells of Draconic Sorcerer, their Magic Missiles damage is more than doubled, they have Overchannel and access to more spells and possibility to swap them when needed. Against all of that, basic Metamagic options, additional AR (that is covered by Mage Armor for Wizards) and slightly more health pale in comparison.
To keep power balanced at lower and higher levels between Overchannel / Empowered Evocation and Quickened Spell, Quicken Spell could affect levelled spells only starting from level X, so that it is not abusable at lower levels and have a spell level cap similar to Overchannel spell level cap. It could also have increasing SP cost similar to Twinned Spell (so that Twinned Spell can affect 2 targets for 1 spell slot and Quicken Spell can affect 1 target 2 times, but for 2 spell slots, giving both Metamagic options their niches) to keep it from being too much utilied at higher levels and with higher level spells.
