Falling Icicle
Adventurer
It's an interesting suggestion. I like it. I like the potential flexibility...it would undoubtedly be enjoyed by many and/or work well in...well, a fantasy RPG system that wasn't D&D.
The thread and all of the others like it (not meaning to single you out, Falling Icicle) discussing magic systems, in general, are working off of the flawed (however popular) premise that wizards and "vancian" magic require fixing.
If you want to use traditional D&D wizardy, all you'd have to do is remove the spell points from your game. That would be quite easy to do, and fits with the whole modular approach that 5e is striving for. That's one of the things I think is a big pro of this idea - it's easy to modify.
I still don't see the problems with vancian casting which can't be solved by good (non-static) world design which should be the default anyway.
I'm not sure I get what you're saying here. Are you suggesting that the mechanics of the core rules don't matter? Correct me if I'm misunderstanding you, but that would be the rule 0 fallacy: "it's not broken if you can fix it." On the contrary, the better designed the core rules, the more attention the DM can spend on world building instead of fixing the rules.