Okay, for clarification. I'm not talking about if a mid laner is gonna go bursty. I'm mainly talking about the support role.
There are many different types of supports.
Leona, Braum- Tanky
Soraka, Sona, Nami, Janna- Sustain
Blitzcrank, Thresh, Nautilus- Engagement/tanky.
Sometimes teams want a healer, sometimes they want a tank. sometimes they want an aggressive bot lane. Just a suggestion.