Duelist to Smokes Pipeline

Why do so many duelist players switch to smokes?

Examples:
Kingg
Bang
TenZ
s0m
Keiko

Because there are too many duelists and controller is the easiest to transfer to

MaKo
Karon

duelist to sentinel pipeline is obviously the strongest

controller requires less thinking to use abilities than initiators and sentinels

Sayf

cause controller takes 0 skill