I'm not sure what you mean with "viably completed". I skip robber quests depending on character and character development, and give up on the forest cover quest sometimes. The bird quest can be tricky, but I don't think I've failed it yet.
I've failed the shelter quest once, due to getting killed by the wolf (quite bad luck with the rolls, with 3 effective 80% rolls missed in a row, followed by an unconciousness inducing bite).
My recent forest spirit quest took a fair while as I had to look for materials for a number of months.
However, if you say "all those area search quests are too much of a hassle to be bothered with" and skip them because of that I can understand it, but don't consider that choice to be a sufficient reason to change the frequency,