Honestly, why don't they bring in pros to playtest champs? At least for NA they are already there and will give valuable advice. I don't trust the plat riot employees to really know how a champ will effect high elo.
To be clear; a majority of our high level testing is with players/Rioters that are currently masters+, previously pros, or both.
In addition, while I agree having current pros play a champion to give their impressions would be more than 0 value, implying that they would have the right read is pretty unproven. We review the examples all the time of how pros thought Zeri and Ksante were useless on release (even when playing in their own ELO, which is not guaranteed in internal playtests).
The reality is that it's really just up to myself and my team (Game Analysis) to do a better job at identifying the real-world effects of dangerous patterns earlier than we do. Using K'Sante and Zeri as examples, they were both identified as risky designs for a number of reasons, but where we drop the ball is quantifying what is dangerous but tenable (Akshan Revive, Renata berserk/revive, Lillia speed) and what is dangerous and untenable (Zeri speed, K'Sante sharpness). When we fail ...
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