Agreed.

As an aside I did notice the tool seems to have had an upgrade as a couple of the bugs appear to have gone and it now shows seat availability by fare bucket when you select flights. Still plenty of bugs left though like not being able to select QR on the first sector, the flights it offers being randomly a bit random (eg sometimes LAX-HKG only QF via SYD not CX direct !!!) and it not being able to tell the difference between a <24 hr transit and a >24 hour stopover.

I don't know why they can't fix all of the bugs. They only have to try and use the thing with real itineraries people have booked through agents or airlines to see it doesn't really work very well. If they did that, added the ability to select any oneworld operated flights, including code shares, that we know exist for a given route (as ITA matrix pops them out so the data is available) and added an option to let you select the ticketing carrier then it would be very useful. But they haven't, probably won't and it isn't !!