Disabling champs for Pro but not for normal/ranked games

What's with the current trend of disabling champions/strats in pro games but leaving open the same champs and strategies in normal ranked games? so far I've seen Jhin with Rageblade disabled, Karthus with smite disabled due to the nunu/karth strat, and now Taliyah with smite disabled despite being almost pigeonholed into jungle since her mini-rework took away most of her laning strengths, but made her very strong in the jg. Why is the popular thing to do now disable annoying/"OP" things in pro play but let us deal with it in normal games? Shouldn't the goal be to FIX something if it requires being off-limits?
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