I personally experienced the same story when downgraded after opening my mouth. In my very small congregation some unbaptized teenagers were carrying the mic. Sisters stayed on their chair, like me. It was seen as a training for future brothers.
That’s why I was very surprised to see sisters managing the computer in my mom’s hall. That would not happen in my former congregation. Maybe it was some local initiatives in this very small congregation, but some brothers were still available and used at some other tasks, so no problem with them
Anyway apparently there was recently an internal letter to stop this, maybe except if there is really absolutely no brother available.