I think this talk of 'taking it out on the crews' has been taken out of context.
The way I see it is this:
Nearly every Ryanair flight these days askes for a cruising level which is different to that filed. Sometimes this is only a couple of thousand feet, but sometimes it is up to 10000ft different. Often the filed cruising level may be FL270 to avoid a high level slot restriction but the crew ask for FL370 on the frequency. They are often given climb as ATCOs try to help. On more than one occasion this has led to an overload of a sector further along the route which had not included the flight at its new level in its traffic volume.
From now on, it should be: you file it, you get it. If FL270 is the filed level, then that's what you get. If it means your fuel burn is higher than you expected, then file an ASR and ensure the company management know why.
The same is true of shortcuts: filed route is flown route.
That is providing the service as requested by Ryanair to the letter. MOL can't complain then.