Pot calls kettle black!
I'm actually a Ryanair fan, their pilots know their planes and capabilities inside out and never cause me any problem; and are both flexible and helpful to the extreme.
Their flight planning however is another subject. There are various conditional or "part -time" routes available which Ryanair do not use, if they did they could take advantage of short cuts on those occassions. ATC will re-route if workload and capacity permits, but sometimes the co-ordination/flight plan amendment/slot /sector traffic load and complexity mean that this cannot be done.
An operating economy seems to be a one-size-fits-all attitude to flight planning......so back to you Mr S.....the ball's in your court....do your homework before blaming ATC.