I'm A Banana
Potassium-Rich
I agree with Quickleaf, about the components and focus. Why should the sorcerer waste his precious metamagic options on getting something that should be innate anyway, according to the class fluff?
Fluff is always whatever you want it to be. Sorcerers maybe have to use material components because material components are required to evoke magic out of your body and into the world - the bat guano or wand or whatever resonates with your inner magic, and just waving your hands around wouldn't do that. Maybe something else.
No more or less controlled than any other AoE spell.
The grease itself is a stable substance, not a momentary wave of power.
This always bothered me. If I'm a wizard, and I find this spell, I'm saying to myself "Tasha? Who in the nine hells is Tasha? Well, this is a neat spell, it's going into my spellbook, but I'm certainly not giving this Tasha hack credit for it.". I also fail to see how incapacitating someone with laughter is inherently more wizardly as opposed to sorcerous.
It's fluff - Tasha is a famous wizard, and she made this spell and those who know this spell have her invention to thank, or they'd be ignorant of the great legacy of magic-users of ages past. Sorcerers, of course, don't invent new magical patterns.
I'm AFB, but wizards do get this spell, do they not?
Yeah, maybe they do. Another way to consider it: PfG&E is spell requiring affinity with planar energies, and sorcerers just don't muck about with that - the rift between worlds is something only those who pull reality apart at the seams can understand and use, and the sorcerer just doesn't have that intellectual focus. Instead they just DO it.
I mean, I'm not trying to say that there's one way it has to be, just that it's fine to be fine with the sorcerers as they are, too. Certainly having to use material components and not being able to cast PfG&E or Tasha's or Grease doesn't make my gnome wild mage seem any less sorcerous.