Our CFI insists that if there is a LH circuit in operation, then no turns to the right should be made within the ATZ. (Similarly of there is a RH circuit no LH turns). Much like on a motorway, you're much less likely to hit something travelling in the same direction. A/G service FYI.
Given we can all miss traffic, I find it quite concerning to hear pilots considering shortcuts, especially if it is common practice.