With the same strips of bitumen at Melbourne and a promised new runway for the last 35 years, it is only logical that congestion is an issue.
That an RNP approach could be flown with a range of speeds meant flow control was degraded.
Frequent visitors to London will be well aware that standard speeds and profile with related distance profiles are something that is used to enhance flow control, reduce confusion from different profiles and ultimately allows the airport to function at high capacity.
Add in neighbours, buffoon political 'idocracy' and other vested interests it is surprising anything happens at all.