3D Touch, at least thus far, is pretty unimportant IMHO.
Touch ID on the iPP isn't really that slow. Not finding it disruptive even against my 6S.
iOS isn't OSX, but we knew that. Need OSX with a trackpad and keyboard? The rMB is available.
Most of the apps I use make full use of the iPP's screen and multitasking ability.
I agree that it's unacceptable that the Pencil and keyboard are still unavailable a month after the iPad's release, but I love, love, love the Pencil for PDF markups and notes.