STOP allowing people to first time champions in ranked

Now, before I begin, this is NOT me blaming my teammates for all of my losses.

So, 2 days ago, I enter a game, my mid laner picks Talon. I check his OP.GG and he had never played Talon in his life. I added him after the game and politely (not memeing) asked him why he decided to first time Talon into ranked, a queue that people like myself take seriously. A supposedly competitive mode where everyone tries their best. His response: I felt like it.

So, 2 days later I join a game and OP.GG my teammates as usual. My top laner, a Nasus and Malphite main (with pretty good winrates to be honest with you) locks in Lissandra against the enemy Garen top. He had 0 Lissandra games in his last 2 ranked seasons. None. 0.

Why is this allowed? Why? Why would I have to lose LP because someone else decided to first time in ranked?

This goes for new champions/reworked champs too. Either have a mastery rating (like level 2/ 5k points or whatever) or make it so you can't first time champions into ranked. It is ridiculous.

And before you say "what about new accounts/smurfs/whatever". Not enough of a reason, since those guys unlock their mains first ANYWAY, probably played them in normal queues.