[u385639]

I believe your 3 points are covered by dishonesty, and perhaps the writing process can be said to be a potential cure for "lack of X". Still, when one is competent and has something to say, writing is not difficult in the sense being discussed, only technically.

[twodave]

Wanting to write about a subject you're not fully prepared to write about isn't dishonest, it's just premature. I think the difference that this has from dishonesty is dishonesty can be cured by... simply being honest. These 3 hypotheticals I've mentioned (and there are certainly many others) can all be cured instead by doing more groundwork.