When did the Perfromance guidance in I320 for list Sales orders with details & shipments change from make 2 requests to make 1 request?

Hi Acumatica community,

This is more for my personal interest/because I like to understand things.  I figured a long time developer might know.

In-between when I initially sat I320 and when I’m redoing it now, the guidance in the course changed.

The new guidance is to send 1 request, with a double expand if you’re retrieving records from.

So I have 2 questions:

1. When did the guidance change?
2. Why did the guidance change? (Technical perspective)

I spend a fair amount of time explaining reasons for choices to implementers/developers, and while I’ll certainly follow I320 it helps to understand why the guidance changed.