Excel blinking cell

Lorenzo,
Thanks for your comments.
You are not the first person to ask for this functionality. Statistics show that most users do not want the option of blinking cells as the effects are pretty awful , and that simply changing the background color of cell is just as effective without the eye strain of a blinking cell.
MSFT prioritizes adding built-in functionalities based their assessment on best idea top suggestions. that's why they have created excel.uservoice.com Excel’s Suggestion Box for users to submit Ideas and suggestions for improving Excel.

Among many features requested in uservoice, the flashing/blinking cell only has the min votes ( two votes) as of today and you can add yours if you wish https://excel.uservoice.com/forums/304921-excel-for-windows-desktop-application/suggestions/33099685-flashing-cells-under-specific-conditions
It shows that only few users wants this feature, however the door for VBA based solution is open, simply few line of code time-driven macro can add the functionality for those users who really wants it. There could be thousands of functions and features that currently are being handled by User Defined Functions with VBA that are not available with built-in functions, imagine if everyone asks for their desired functions or feature to be added to Excel, what will become of Excel?

I have attached a sample file which is from fellow MVP Tom Urtis that shows how few line of VBA can deliver the flashing cell.