I am 6 months into my first Platinum year. And I will requalify for next membership year.
I didn't 'chase' it but I needed to make a few flights and chose strategic ones for SC. By virtue of the covid rollovers and the bonus SC I will make the 2nd year, but I doubt you'll see me in black past that.
My travel is mainly leisure and long haul. Since becoming a member of this fine forum I have become accustomed to business class seating on long haul and I do not wish to turn right again, the life on the left turn is great.
So far, I have enjoyed excellent service from Hobart, not so from South Africa (they booked a connecting flight in UK departing 6 hours before I left Sydney). I have requested and instantly was approved for a J reward flight SYD-DFW and YVR-SYD. I get to sit in the first few rows. On international flights the CSM comes and says hello. I get to eat in domestic J lounges (so, better toasted sanga's, yay). Spent some time in Mel F lounge. Have so many pairs of QF pj's that I don't need any more for a while (oh, OK, I'll take a pair thanks). I have 2 requests in for a J reward Sydney-LHR in 12 months which may or may not happen.
What's not changed for me; priority boarding, seeing more rewards flights on a QF website search, priority luggage (pfffftttt crew bags come out before mine). American Airlines doesn't rate me, so I had to pay for Main Cabin Extra seat on an upcoming flight, but the other OW peeps get it comp'd.
I cannot pay for a Q suite or a QF J 'suite' on most flights past NZ so the Platinum request benefit is valuable to me. Although that is HARD work currently.
Seeing you are travelling premium cabins, you are not going to get much out of Plat, except for possibly easier-to-obtain J domestic seats and access to the top end lounges across the world. But most international business lounges are pretty good in my opinion if they aren't managed by QF.
Change the QR suite to a QF seat and you'll make it by the sound of it.
But for me, I'd be asking what can QF do for you that QR are not giving you now?