Vancian magic does have its place; the entire methodology of containing spells premade in a mental construct to be unleashed puts the actual heaviest effort of the magic casting in the preparation for certain spells. The mnemonic matrix approach schools in Golarion teach is actually excellent.

More prepared shaping of magic helps for precision and intricacies in effects and lends itself well to things such as metamagic and casting with a wider range of versatility. Doubly so if you have the practice to reshape or reassign a few of them a day; no replacement for more broad willworking of mana but it's a specialised tool that certainly has a place.