Spell points double down on the biggest caster problem: going nova and forcing a 5 minute work day. At least with slots the caster may have burnt their most powerful spells in the first room of the dungeon but they won't have completely drained themselves.Honestly, Spell Points would save on a lot of headaches, and I've even played in D&D games where we successfully used Spell Points... but Vancian/pseudo-Vancian feels like one of those big sacred cows that they can't seem to sacrifice without much gnashing of the teeth, but for what it's worth, I'd be for it!