With the hourly rate so high on the 787 and the salary also high, I can't see why
A commuter can't afford to pay for a nights accommodation beforehand in Perth before flying up to London or Paris the next evening.
On the East Coast no current types fly that sector length at night.
I can see where Qantas would require you to be in port the day of departure from an FRMS perspective. Be close to a 19-20 hour tour of duty. Having had to drive to the airport, then fly 4-5 hours before a near 19 hour flight isn't wise. It hasn't been done before so previous commuting examples are invalid.
Great news for the Perth crews