A 3.X Wizard does not "memorize" or "forget" spells. They start casting them, with the aid of the spell book, during an hour preparation time, leaving a final trigger step for later.
Which is just like memorizing.
And having some spells with 5-minute rest times, and some (most, even) with 6 hour rest times still involves resource management. Lots of it. Even those short-prep spells are a significant resource to manage. It's a little different, sure. But if that's the extent of your argument, that it's different, so it's bad, then I guess there's nothing more to discuss.
Hey, a battle is looming, better memorize attack spells.
Ok, battle is over, there is a door, better memorize knock now instead.
Well, we got through that room, better memorize more attack spells instead.
That sounds to me more like having everything you want to do at any time, only 5 minutes away. Not managing your resources, planning ahead etc.
And as far as I'm concerned, pure-Daily Vancian is a failed system... so let's table talk of which things are failures and which are not.
34 of the 38 years D&D has existed points to you being wrong.
The numbers have changed, sure, but the scaling rate has always been roughly the same. Without really changing that rate, dozens of spells at high level is pretty much inevitable. Suppose 5E's spell progression includes spell slots of a certain level being lost, as new spell levels are gained, so that more powerful spells are gained at some levels, but necessarily more spell slots. It has never worked that way in the past (except sort of in 4E). Would that still be Vancian-style?
Not really. I wouldn't care for that at all.
I also wouldn't like a fighter who could trip someone for 5 levels, but at level 6 he forgets how to trip people and can only trip AND stun them at the same time. Changing how spells increase in power is enough (requiring a higher level slot to increase the power of the spell). Removing lower level spell slots isn't a good fix in my opinion.
My suggestion tweaks the specific numbers for Rest, for a small subset of spells.
Yes, it does, and I disagree with it. Memorize once, cast once is my preference. Encounter powers being reskinned, is not something I want to see.
3.X completely killed Memorize and Forget, and replaced them with something else.
Incorrect, it worked the exact same way. The wizard/cleric/druid/bard had the spells imprinted on their mind, and when the spell was cast, it was lost for the day (or for spontaneous caster, that slot was lost). You can say the fluff changed, but how it worked did not change at all.
What "Cast" means changed fundamentally, from 1E/2E (where casting times longer than melee attacks were the norm, and easy to interrupt) to 3.X where most cast in a single action, same as an attack, and a spell was nearly impossible to interrupt.
How long to cast a spell doesn't mean the definition of "cast" changed. It means the time it took to cast a spell changed. The time to swing a sword changed too, does that mean that the definition of "swinging a sword" changed? No, it merely changed the time involved.
But yeah, the thing that looks kind of like 4E. Can't have that.
This part we are in agreement on.