As a person who has played a Sorcerer from levels 1-7 so far, and all I want to do is be a blaster, these changes really suck.
Levels 1-4 I put up with subpar damage. I was the squishy hiding in the back while the barbarian did all the work. Sometimes I got to shine briefly with a good burning hands, that's it. My Scorching Ray was a small way I can spend an extremely limited resource to do big damage.
Level 5 I could Fireball, and that's amazing. Big groups I got to shine, when it happened. Otherwise it was the martials and their Extra Attack that left me in the back again not doing much.
Level 6, aha! +CHA to damage! Suddenly my Scorching Rays (6d6+15; 36) were pretty sweet, equal to the raging barbarian's ON DEMAND SWING (on-demand advantage; 2d12+24;35), but not as good if he manages to crit (double crit chance because of advantage) or kill (duh, minions die when you do 35 damage) = 3d12+36. But hey! When I twinned Scorching Ray, it kicked ass. I got to finally be the glass cannon blaster I wanted to be. I used my signficantly more limited resource to do big damage when needed. And Fireball+CHA! Woo!
And now comes the nerfs. No more twinned scorching ray. No more CHAx3 rays. Back to being the glass slingshot that can't keep up with the martials. There's still Fireball, which is nice, but that's it.
Ironically, my best combat strategy, even before this errata, was Polymorphing into a Giant Ape. But hey, it's polymorph, can't nerf that right? Gotta nerf the blasting spells!
This is super upsetting for me.