Valid point in rspect to CAVOK and alternate fuel, however with some requirements JAR allows planning without destination alternate under certain circumstances.
I think you are well, and I mean well in terms of miles, cautious. We will never be able to cover all possibilities in our live and this applies to flzing as well.
I see your point that you try to cover all posibilities. But, can we cover all of these? I think we can't. The rules and requirements in JAR are based on a resonable assumption that things may happen. Even with sfety a top priority the rueles have to be reasonable and practicable not only operational and safety wise but also economicaly.