people who balance the game shouldn't be bronze

Pro play is the most balanced level of play. If they balance around low elo play (where the vast majority is) people like Lee Sin, Katarina, Camille, Zed, Riven, Ezreal, would all see buffs due to drastically low winrates and general unplayability at lower levels due to skill differentials.

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I don't necessarily agree with that. Does every coach have to be a player?

However, I would say that the game shouldn't be balanced around pro play when 99.999% of the games played aren't pro.

So the game isn't balanced around pro play. If you notice their are minor adjustments to champions that aren't in competitive play. For example Chogath, The Warwick Rework, and many others. The point being the refind tunning of champions is normally done for the community. In other words their player base, or in business terms "Income". Competitive adjustments are specific patch's. That tend to happen around specific time frames. They are usually in the begining of a new season, Slightly before MSI(After playoffs), usually their is tuning prior to the start of the summer splits. Then another patch that hits before worlds.

If you want an example of how this works, look at the LCK. They never play on all the patchs, like normal players do. They skip patch's frequently, and remain settled in a patch for extended periods of time. The LPL is set the same way and so is the North American LCS.

i didnt say pro the game should be balance around plat and above

so azir and ryze were balanced when they had a low winrate?

? hows it not bad players shouldnt be able to change the game