Indeed Arcane Recovery by itself is clearly inferior to Sorcery Points used to increase daily casting. The Sorcerer is still said to have an edge when wanting to go "nova" thanks to sorcery points' flexibility. But I still think this alone is not enough to give the Sorcerer class enough uniqueness (perhaps I am biased because in my games there is usually no need to nova), that's why I dread any suggestion to give metamagic to other classes.
The only reason I play sorcerers at all is for meta-magic. I'm not inclined to give that to another class in a similar format either. I don't mind wizard traditions gaining meta-magic types of abilities related to their school, however; a few of those exist and aren't really a concern.
I like to nova once in a while but we typically play longer days and that's not really common. I don't need to spam meta-magic to make it meaningful. I use meta-magic when it matters in important fights and often conserve it.
The Extension spells were in 1e, and are the precursors to metamagic. While some 2e specialty priest spheres had access to some metamagic spells, (I think), it was mainly a wizard thing.
The
extension spells in 1e and 2e were spells that targeted other spells. That's like calling
counterspell or
dispel magic meta-magic. Those spells were cast on a subsequent round if by the same caster using actions and prepared spells. They didn't even need to be cast by the same magic-user, however, and a different caster could extend someone's spell.
I would have a hard time calling that meta-magic in the 3e terms, where it was available to all classes and specifically modified a spell as it was being cast.
My Dark Crystal analogy, (beyond signaling my age

), also is to demonstrate the Magic User theme used to encompass Talent and Learning.
We don't play "The Dark Crystal". We play "Dungeons and Dragons". Taking inspiration from pop culture is fine but it conforms to D&D, and not vice-versa.
Vancian casting is not the same as the books from which it originates either but we don't use that to justify changing classes either, and that's a more relevant association.
I am also old. I remember when the movie was new, but read the book first.
Now, magic isn’t science, but the wizard is often pigeonholed into being the “scientist magician” in any thread that brings up the Sorcerer/Wizard divide.
That's because it's how the classes are described. Magic isn't science but INT based wizards are studying magical theory while CHA based sorcerers are born into bloodlines of magic.
The Bard class sidesteps, the whole issue, by just being awesome, and capable of doing a good job of representing any archetype.
Lol, awesome by not having meta-magic, flexible casting, arcane recovery, a ritual book and limited access to the list of spells only available at higher levels?
Bards are weaker casters than either, and
mage armor and
shield or
absorb elements tends to make sorcerers and wizards less squishy than light armor and
heroism.
Bards have better skill and ability checks. Bardic inspiration is useful. They are significantly weaker spell casters.