One day in 2018, Ion Hazzikostas, mentioned WoW’s “Pro Mode”, and Josh Allen suggested that Pro Mode should be a M+ Affix and Ion responded “we can make this happen”.
So why has this not “happened” yet, I think it’s a great idea and a nice challenge to implement pro mode as a M+ affix.
For those who are unaware what WoW’s “pro mode” is, Ion Discusses it here: