This is such a basic need when configuring routines, especially with the limited triggers and actions we have available to us. The Echo/Alexa system definitely needs the ability to do this.
Real world example:
I have an Echo Flex with Motion sensor that turns lights on in two different sections of the basement. My office is in one of these sections. I don't want my "Desk Lamp" to shut off while I'm working, but my hours vary, so it's not like I can just set it for certain times of the day. What would work perfect is if I could tell Alexa to, "Leave my Desk Lamp on" and she would disable the routine that uses the motion sensor to turn it off.