Why is QFF so bad?

Been a QFF for about 15 years now, alternating between Platinum and Gold (now lifetime Gold). Moved to the US a few years ago and with limited travel on Qantas, decided to open a Mileage Plus account with United given all my travel these days is with them. I just went to book my first points (miles) flight with United and went in with low expectations given how insanely bad the QFF system and options are.

But wow was I surprised. I was able to book a return business class trip from the US to Australia in any week I wanted. There were so many points options available. They also offered the option to book economy and use PlusPoints for an instant upgrade to business (which I did for the return leg). And the system was incredibly easy to use to search all the available options.

Qantas on the other hand, had zero classic reward business seats to any of the east coast cities… why is it so bad? I thought maybe its volume of flights, but does United really have more capacity between the US-Australia than Qantas? Or is just that they open more seats for points bookings?