March report is 8.1% of all Xr flights cancelled
Of which you'll find many I believe were contract charters that were 'not required' by the companies who originally enlisted them. Yes, they've had their fare share of breakdowns lately, but it's not ALL about 'unreliable performance'.
As to QF's "1000 departures" vs XR... the average age of QF aircraft is a lot less than XR's ... older aircraft of course tend to go tech more often than new ones... no matter the airline!!!