The Vancian system was heavily limited, it wasn't that popular once other options became available, it didn't match anything in the way of standard fantasy tropes. In nearly all measurable ways, the pseudo-Vancian system of 5E is superior. It's more flexible, it at least slightly more closely resembles genre standard. Everyone I know likes it better. Under many circumstances,
I like it better.
But...
There was something about trying to pick which spells you'd have access to.
I dunno. I don't really have a point to this, and given the choice, I wouldn't change 5E to go back. But... I do still miss it, for all its flaws and quirks.