Maybe with Allegri. But lots of coaches would probably try them in those positions. Allegri's paper even stipulates he prefers a 4-3-3 with #10 at RCM. Lots of coaches like the #10 at RCM. Guardiola is one. Hamsik plays LCM at Napoli.
There are tons of tons of lighter CMs than Bernardeschi, who spent time playing LWB of all places. Napoli alone has Hamsik, Zielinski, Rog, who are not exactly bulldozers.
Dybala is clearly a striker who thinks first, second and third about shooting on goal. That's a #9 in my books. How far is he away from Aguero, David Villa, Griezmann, Lacazette, Gameiro etc who are all short strikers who have spent time playing alone up top.
Was Mertens a CF until he became one out of nowhere?