Uncanny valley:
"This sorceress has a force of personality around her, she looks almost human, if not for the scales and the claws "
Or the wild mage, with no hair, red color and feathers?
Shadow sorcerer, looks like a cadaver, or doesn't blink, or is pale....
Basically each new bloodline finds new ways to make sorcerers look like freaks (Except perhaps favored soul).
Now, I know that wanting to do the same things a wizard can without being a wizard sounds like wanting your cake and eating it too -though you can't eat cake if you don't have it first and if you have it but can't eat it is as good as not having it-. But it isn't that weird, there are plenty of examples from real life where it is possible -they are just offlimits by policy-. So lets imagine:
We have a society of cats and dogs, dogs have lots of rights, access to work, education, wealth and everything, while cats are second class citizens -if they could just vote-. A cat rises to demand for equality and it is told: "Oh but you can have all this and be our equal; you just have to stop being a cat." , "But I'm a cat, not a dog, I shouldn't need to be a dog to have equality", "Well sucking is part of being a cat if you are a cat you cannot have all this, period."...
I want sorcerers to be equal to wizards, not identical. Sorcerer identity isn't tied to capabilities, but to the story and unique traits -traits, using cha to cast is a trait, being able to create demiplanes is a capability-. Otherwise there would be no point to my point.
You mean having giant feathered or bat wings is odd for most races, and honestly I see no reason a Favoured Soul might not display a sign of thier God on thier person.
Wild Sorceror are good at save or die as well as creating all purpose chaos.
Dragon Sorcerors aren't just blasters, they're aerial support, blasting from the skys.
Storm Sorcerors are the gishes, Booming Blade and Lightening Lure are almost must have spells for the Storm Sorceror. Of course later on they too can rain ruin from above.
Shadow Sorcerors are natural illusionists and tricksters, teleporting between shadows up to 120 feet as a bonus action, creating hounds out of shadow that keep enemies knocked down. They can summon darkness at the cost of 1 sorcery point and see thru it. Honestly its the caster verison of the Way of Shadows Monk.
The Favoured Soul, likely to be changed like they did the Storm sorceror, but at least its likely to retain its wings, uniqueness depending on deity, divine instead of arcane focus, and possibly martial prowess, and some sort of healing. None of that say blaster.
Actually I suspect that the next verison of the Favoured Soul will look alot like the Shadow Sorceror, instead of a spell list, the ability to use sorcery points to do magical spell like abilities.
Instead of Darkvision, the armour and weapon prof, instead of being able to summon darkness that you can see thru, the ability to channel divinity with a sorcery point, and/or cure wounds (or both), instead of being able to summon a hound of ill omen, you summon a spiritual weapon/creature with sorcery points, wings instead of teleporting, and instead of becoming incorpreal, the favoured soul might become an minor Avatar of the God by spending 3 sorcery points for a minute.