OT: Use of "please" in technical documentation and messages on screen

[Andersen, Verner Engell VEA]

Hi
Once I learned that you shouln't use the word "please" in technical
documentation - that it was like asking the reader to do you favor.
 
Does this still hold true? Is it OK to have this message displayed on
the screen of our user interface? 
 
"We are updating the result list, please wait"
 
Best regards,
 
Verner
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