Why QA should never be left "in charge" of marking priorities on tasks before "demo day" deployment and client handover of a product.

New and refactored, key, features need to be deployed by "demo day", and most developers and the PM (not me) have already been re-allocated to new clients and projects. There's several things being done in paralell to get it done.

QA: We need to be able to download CSV files showing affected users if i do extremely rare action X, and this should pop up in the system for the first 24 hours after doing X.
Priority: High
New priority for feature Y: Medium
(Action X may never be used at all)

This is implemented, reviewed and deployed.

QA: I want a timestamp in the file naming, I'm experiencing duplicate files.
Priority: High
Feature Y: Medium

Develop, review and deploy timestamping for the CSV files.

QA: They are only marked with DD/MM/YYYY, I performed rare action X several times in one day, I can still get duplicate file names marked with numbers. This is #1 priority!
Priority: High
Feature Y: Medium

...Okay, this is nitpicking, this will never happen, but fine. Overtime to do the extra minor, minor adjustment, down to hours and minutes, get it reviewed and deployed at the end of the day.

QA: I managed to do rare action X 6 times in 1 minute, I have duplicate files. It needs to be down to seconds. This is top priority.
Priority: High
New priority for feature Y: Low
.........

Constant interruptions, moronic priorities and voicecalls throughout the entire day.
Dear QA, you can be fucking donkeys at times.