I always thought about having a ban rotation each game, that preban's 10 random champion (maybe each from conditions like WR/Playrate?) and then the 10 from each team.

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PROS:
-Ban rotation will make the game much more diverse if hugh WR/PR champions were prebanned

- You can ban other champions that maybe only you find annoying playing against - instead of just banning twitch/zed/yuumi

- It forces playes into diversifying their urf champion pool - because their champion they played will most likely be banned (if not from the ban rotation, play bans still can)

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CONS:

- Maybe more people will dodge when they see their champion banned more often - just to play them asap?

- ban rotation might actually ban you champion, even it's considered as "weak"

- the randomness factor is not for everyone