A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
Like I get it, they want to ensure that users have an optimum experience with excel. In that vein I understand a notification letting the user know that certain choices made in the formatting of their file may cause slowdowns and that it is not excel itself that may be causing a poor user experience. HOWEVER! A popup that persists leading to continuously having to acknowledge it every time it is used is in very poor taste. While the popup is out of the way at the top it has the alert format which is distracting and it takes valuable screen real-estate.
It is not unreasonable to have the alert to let the user know, THE FIRST TIME, but allow the user to permanently disable specific alerts. The answer of it is not possible because it would take a lot of coding is wholly unacceptable.