But regarding multiclass spellcasters, the way I'm reading it is that if the character has high level slots without a corresponding high level spells known, they'll get some minimal access to the next high level spell known. It sounds too complicated for PnP, but a breeze for computers.
e.g.
Sorc2 and Wiz3 (caster level 5) with a couple level 3 slots. The Sorc gets access to say one level 2 spell known and the Wiz to one level 3 spell known.
This is comparable to a Wiz5, maybe a bit too generous even. The Sorc/Wiz has more flexibility and only a little less power. But at level 6, it becomes advantage to single class Wiz.
The weakness of multi-class spellcasters is most pronounced at lower levels and the stress point is level 5 when single-classed characters get significant power-ups. I'm guessing play-testers noticed the party gimp then.
Multiclass warrior-types at level 5 without extra attack stand out just the same. A bit surprised they weren't singled out for buffing. Then again, what can you do?
