There are very few reasons for a new phone or tablet to launch with less than Android 6.0 Marshmallow at this point — and fewer reasons for you to buy them.
Things that make sense to those of us who pound keyboards for a living — as well as you on the real-world side of things — don't always make sense to the folks in charge of actually getting new phones and tablets out the door. So let us be clear with our language here:
It is not acceptable for a manufacturer to release a new device running anything less than from this point forward.