Experienced or inexperienced, there is always an expectation.
Ofcourse crew are human and can be flustered but why should they take it out on me, the paying customer. Everybody has good days and bad days but on bad days they should not take it out on their clients. Maybe EK can be forgiven for the first sector leaving London (where I am based by the way); what about the rest of the sectors? Dub-KL-Dub-Lon (span of 10 days)?
The sad thing is that the more an experienced traveller you are the less likely you tolerate and the more you are prone to expect out of an airline.
Experienced travellers want to be treated with respect with key activities (like a meal service) done efficiently and then be left alone. Experienced travellers do not keep pressing the call button for another glass of champagne. All I want is consistency based on the service I have purchased, is that really asking for much? I don't think so.