I have to disagree with the issue being the operator or user issue.
The problem has to do with the SAMPLING FREQUENCY AND SAMPLING RATE of the device when dealing with AC Voltage. Unless you fully understand the basics of how this tool and App work, this is not a standard item that most people have had to deal with.
So from a SAFETY standpoint, at least when it comes to AC Voltage measurements there need to be fail safe defaults to protect the end user. This is why an electrical Proving unit is now part of certain testing and safety procedures.
Sorry, but the AC Voltage detection problem, which is a PROBLEM is part of the basic system App and configuration and needs to be addressed.
You cannot and should not expect every end user to fully understand how this specific tool captures and displays Voltages properly.