Notams?
Were there any NOTAMs out saying expect delays? If not why not? It's a fair question to ask.
It's clear from other threads that Perth ATC staffing is in crisis mode right now; they are 4 down in the TCU and 2 down in the TWR; then the surrounding sectors (Melbourne based) also have significant staffing issues; it all conspires to disrupt services at Perth.
Don't expect vast improvements anytime soon; if they do manage to "fix" staffing then along comes the WARP (route restructure) and probably MAESTRO and probably CTMS or similar. All this will rely on "industry" complying with the times etc. Of course there should be then an obligation for us (ATC) to comply with what we've given; or at least give you something else; rather than making you queue on a taxiway.
I heard that only one ATC was doing the West Sectors yesterday for a 2 hour period, when normally there would have been 6 or 7; the staff have reached the stretch point on OT and 'pop' no more sir 30 extra shifts a year is enough. Some have worked over 50 extra shifts.