Pier J showers are small, but still very usable. If they need to do that to fit more showers in, then I have no problems with them doing it. My last trip, I didn’t even visit Pier or Wing J lounges, instead opting to use the Qantas J lounge.
The penultimate first world problem: Should I use the Qantas J, Pier J, or Wing J lounges before my flight leaves?
I guess choosing between Pier F and Wing F is the ultimate first world problem