Why and at what point Did Britney started Incorporating parts of thr original BOMT Choreo (and Grammy 2000 Timing) To POM?

[RulesRules]

I'm talking about the shimmy and quick-face-to-side move in the "Tell me Baby, Cos I Need to Know Now" part of the song, and the side-to-side step she does in the chorus where in the 2000 Grammy performance and in POM shows outside of Vegas, she does it starting from the "I must confess" part.

 

The original incarnation and the revamp had different moves for that part

And she does the side-to-side thing in the "When I'm not with you" part.

 

 

I thought her doing the Shimmy in POM was a one time thing only. Clearly I wasn't paying attention to the Bomt performances of 2017 and 2018 shows where I'm surprised that she kept it that way.