I really like the idea of the witch being somewhere between occult and primal. I was thinking about the same thing while reading the playtest dokument. The witch having access to arcane magic doesn't really make sense in the new context. I feel like they left it in the 2nd edition to not anger players who are very familiar with the first edition and are used to the idea of a witch being an arcane caster. But same as with the bard, it doesn't make much sense anymore in 2nd edition. Also there are few compelling resons to play a witch instead of a familiar centered wizard. While giving the option to players is certainly not a bad thing, the class concept in general would be much stronger with the witch being based on primal/occult duality.