I would hope Federer isn't eating popcorn, as that is unlikely to be ideal preparation for his first AO final in 7 yearsI think it's idiotic. There is zero reason that the semifinals should be played on different days. Federer is eating popcorn with his feet up. Nadal still has over 8 hours before he plays.
However both Serena and Lucic-Baroni had not even a full day of rest before their semi-final clash.For WTA, both semifinals are played on the same day (at least that was the case this year, can't remember the past), and both ladies have the same number of days to rest for the final. Wouldn't be bad if same was applied for ATP.