I try to go beyond the "finger pointing" or negative feelings, it is totally understandable that many situations cause stress (on all sides, in the air and on the ground), and in our business stress management is important. That's why forums like pprune might come handy. If we can help finding a solution, why not.
I will just complement what eMACaRe wrote.
If you check the IFPS Manual, publicly available on
https://www.eurocontrol.int/sites/de...al-current.pdf - there are statements clearly indicating how IFPS will treat the level changes.
and the important factor, that IFPS will check the performance and capabilities against its models
I have seen many FPLs through my career and quite a lot of frustration that comes with filling them. I can partially agree with His dudeness - it can be quite hard sometimes (with all the route differences, CDRs, FRAs, RADs, TSAs, TRAs, profile detections, ATFM regulations etc. etc.) especially for those who do not have the most advanced and automated CFSPs. And even the latter ones are sometimes lost.
But it is not all on IFPS... States, ANSPs, Military and even airspace Users themselves are many times the reason for a very complex and seemingly hectic airspace organisation. Despite this, Europe handles more than 37.000 IFR flights daily in quite an organised manner.