Is the logic behind this about minimizing people walking past a greater number of pax?

Having just read about the planned free COVID testing on EWR-LHR flights one would hope this rule would not apply on those flights.

I try not to use the aircraft lavatories but it is necessary on longer flights and the use of lavatories with less seats per lavatory is worth a premium to me. One of the downsides of Premium Plus on long haul flights was the trek to the lavatories and long line up, and now I can walk past the "curtain" with little wait time.