Easy too look back at the past and thrown stones,
but remember that aircraft have substantial lead times and market conditions (eg. appropriate config for A380s due to GFC and the like) and delivery times (eg. 787s) or competitor activity (eg. startup of Scoot/AirAsiaX) can quickly change the right answer under long term plans
Except that people were saying at the time their aircraft selection was wrong. How long has the 'Why doesn't QF have 777's' mantra been going for?
Not to mention the well executed addition of the A330, wasn't that just management's finest hour?
That will probably end up in a university textbook one day on 'how not to order an aeroplane'......