Normals Champ Selection Vs Ranked Champ Selection

With the option in ranked you are able to select a role, which i believe is a smart way to use the selection process. But in the Normal's Champ Selection mode you have to use the supposed "caveman mode" of typing your role which is alternatively harder to get the role you want to pursue in the ranked position. Now i don't know why this system is different in Normal's but this mode usually ends up in people dodging; creating bans, and causing friction between teammates. Now i don't know why the system is different maybe someone could explain. The only reasons i could come up with this cause is because people don't want to play roles like support or just people are to new too the game. So if someone could answer this it would be greatly appreciated thanks :)........