I can’t recall a single instance of priority boarding not being enforced in the past 18 months since the scanners were reprogrammed to deny - a complete reversal of the consistently inconsistent nature it was before.
LTG is the reward for your loyalty. Lounge access, priority boarding, additional luggage, seat selection and preferential access to both reward availability and upgrades (over silver and bronze) across not just QF but all oneworld carriers, regardless of your future spend. These are tangible, published benefits that I’d argue are quite valuable for someone who spends considerable time in an airport. That you were Platinum for 6 years (of which some I imagine were comped on account of COVID) is of no consequence to QF - they’ve drawn a line commercially as to how much they expect customers to spend to receive certain benefits.
I can empathise with the aircraft being swapped, but as mentioned before this is hardly unusual on the transcon. I do agree that they should (when booking) only show the domestic recliner rather than the suite, however for a domestic product even that exceeds what you’d get intra-Europe, and is comparable to transcon in the US.
You do you, but when VA can’t consistently guarantee their P1 equivalent’s access to advertised benefits (VIP call centre or lounge access when flying with partners) I’m not sure I’d be holding my breath for an elevated experience.