I suspect this is the reasons there is such a diversity of the hearses in Sydney.
Because the public have little to no preferences or preconceptions regarding physical appearance this gives companies room to experiment and individualise. The idea of what a hearse should be, should look like, is actually not very strong from what I have found. So as long as the companies meet certain basic expectations they can play around with the design as much as they are like.
This is only a thought at best, not even a theory, but it does explain the sheer variety of hearses. There are a few different funeral homes in Sydney, but each one essentially has its own style of hearse, yes there are a lot of similarities between a few. But with experience one can look at a hearse in the distance and know which company it is.
Lady Anne Funerals
Basically the fact that the public do not understand the funeral industry is an advantage to the funeral industry in a sense. It gives the industry room to experiment and diversify itself in ways that the public never notice.
TJ Andrews Funerals