No, IMO, it is poor service. And I have noticed that Panasonic have gone from best service to mediocre, poor service.
I don't know if anyone remembers but about 6 years ago when Panasonic were first unveiling their Viera FHD plasma series, they introduced Panasonic Concierge. If your TV failed, Panasonic provided you, free of charge, a temporary replacement of equivalent functionality.
Something happened to this. They cancelled it for some reason, I'm guessing they decided they could get away with cheaper support.
In addition, the time to order a panel isn't long; if you go onto a service parts website, you can get most panels turned around in a couple of days, a week tops. For a larger 50"+ panel, there might be a longer turnaround time. In which case, I would say Panasonic ought to replace the customer's TV with a new, fully functional one, and keep the old one for refurbishment to recover their costs.
The funny thing is, you really don't need to order a new panel to fix this, at least not temporarily and quite possibly permanently. Their service policy is stuck in piles of red tape and procedure. Picture problem = every board then the panel. Maybe you get lucky and they swap the panel first. But there's never any attempt to diagnose the symptom, it's always swap swap swap because the document 123 says refer to document 789 subsection 3 paragraph 9 which says these boards are swapped first, never any logic applied. They could, for example, set the VSUS pots correctly, order a new panel and allow the customer to enjoy the TV while the panel is being ordered. Their policy would not allow this as it stands.
When you spend $2,000+ on a TV, you expect good service.
That being said, Panasonic isn't alone. Both LG and Samsung have the same problem, but they've always had it, as far as I know.