For some, the extra 50% points may be enough to want WP, as well as First Lounge Access, which is a huge step up (MEL/SYD) from J Lounge access, and of course, the OW F lounges.
Agreed these changes overall suck, but there is still a difference between them. The baggage allowance is still different too, although as a rule, WP's would probably tend to travel with less luggage than more if they can help it (I know I do).
The F Checkin queue is a big one too for frequent international travellers. I've never seen a queue at an F checkin, but have plenty of times at J.
It's still a big difference for frequent international, not so for domestic IMHO.