The G & L's also come in a 3 + 2.
Yeah, there's a ton of 3+2 headstocks. I've owned Alembic, Roscoe, Ken Smith, and Lakland 3+2 headstock designs. I think Yamaha and Ibanez are also 3+2.
There's just not a lot of 2+3. The only 2+3 I recall seeing before I ordered mine was MTD 535.