Benzema is tall and strong but never plays with those attributes, he’s all technique and passing so your points invalid.
If you play a short false nine:
He won't be in the box for tapins
He won't drag two defenders in the box
You can't play some crosses to create a havoc
When you play Giroud/Benzema/Costa, you can use all these weapons.
France looked better in the box and with more sense once when a true Cf, Giroud, stepped in.
Playing with a false nine in 2018, potentially brings a lot of matches with a sterile attack if an opponent parks the bus.