Via an ABC News story about Myki we learn from the CEO of Public Transport Victoria (which is not itself responsible for Myki):
"Any project like this that is as complex as this - you don't get everything right to start with," he says. [...] "Tweaking software is a dangerous thing to do on a project like this at this stage."
So, to summarise:
- It's impossible to get things right up front; and
- it's almost impossible to change anything later.
All timestamps are Melbourne time.