Did you notice that the search at Amazon is not that precise? It's not because they could not make it more precise. Equally, did you notice how milk and bread are in the opposite end of the grocery store? It's not because they could not put them next to the entrance. I suspect that a similar factor can be in play here.

As of slowness, I suspect they don't have a DC an Australia, so your packets need to travel across Pacific and back.

I also suspect that their web site already brings enough customers, and a serious rework to make it more usable won't bring in many more customers, and any more money. Investing in that is likely a poor business decision. I bet their resources mostly go to protection from fraud, legal battles, and other non-engineering concerns.