So stop calling them as if they are one.
They both are mid lane mages first. People just take them bot because Riot is enforcing such a damage heavy meta right now and not the protective utility side which is actually what a support does.
Zyra was pushed bot by Riot, much to her fans protests. (Looking at you, Riot! Shame on you!)
And if we want to get more technical, same goes for Karma and Morgana.
**So stop calling them supports**. They are mid lane mages that are just taken bot for a kill lane, nothing more.