I think it's strange that a teammate can ban a champion that you have preselected to play. The preselected champion should be a non-option for the ban list. I feel like there's people out there just going through and trolling people. When you dodge the draft because you were not able to play the champion you PRESELECTED, then RIOT gives you the time punishment for the next match. This system could be more user friendly and could improve player behavior.
If you're last pick, picking a highly contested champion that I would ban in 90% of scenarios--ie Camile as an example--I'm banning it instead of risking them picking it away from you. That's why you can ban a champion someone has shown intent. Does it suck? Sure. Does it suck even more when you want to practice that champions? Definitely. But you have the ability, and should even be encouraged, to expand your pool so you have more than one champion you want to play.
Sometimes, sure, it's a troll ban because they want too. Sometimes, it's accidental because they didn't see the intent and were banning it anyway. No system could tell that apart, and making intent prevent you from banning that champion could just as likely increase dodges for people not wanting to face OP CheeseChamp of the week.
Now, if it was only in normal draft, then maybe... but then people would get to ranked draft and be like, "why isn't this a thing here? I was used to this in normals, gib in ranked or tantrum."
Edit to add: Also, it's not a pre-select, it's a pick -intent-. Intents are not meant to be a hard lock, they're simply telling your team, "hey, i wanna play this. Can we build a team around it?" For me, as an ADC, a team showing intent of all AD tells me I need to Corki, for instance.
