a simple craft that almost anyone can learn given enough time, patience, and practice.
I don't think that is really true. There has to be a certain aptitude, and most people don't have that aptitude (fortunately, most of those have no desire to be writers anyway) any more than most people have an aptitude for music, or sculpture, or the law, or medicine, or sport, or ... the list goes on. (If by "learn" you mean become good at. At it's most basic level we all know how to write by the time we leave school.) But not everyone has the same amount of aptitude, and certainly some people with a moderate aptitude make the most of what they have with time, patience, and practice -- and I would add persistence -- and so enjoy at least a small amount of success, and some with more aptitude waste theirs because they don't understand the importance of working at their craft, and get nowhere at all.
But, yes, I think a lot of people become too precious about their writing, mostly those who don't do very much of it. They like playing the role of
artiste more than they like doing much writing, and they have convinced themselves that the role is the reality. Fortunately, most of those grow up and get over it.
What bothers me the most, though, is that writers sometimes make such a big deal about how
sensitive they are. Once they become successful, they talk about how soul destroying it was to work at ordinary jobs. I've worked at some of those jobs, and I actually rather enjoyed them (enjoyed the regular paychecks, too) though I never loved them as I love writing. In fact, I've been told by some writers that doing a simple job that requires almost no brain power (what some of those other writers would seem to consider the equivalent of being put on the rack every day and then roasted over a fire) actually leaves them with more mental energy that they can apply to their writing when they get home. Meanwhile, of course, bringing in just enough money to remove any nagging, distracting fear of starvation.
I think that the people who are the most precious about writing are those at the extreme ends of the spectrum, those who don't really have the drive to do it, and
some of those who have become very successful (and hear so often that they're special people who need tender handling that they come to believe it).
Most writers
are sensitive, of course -- and I think sensitivity may be both our greatest ally and our greatest enemy -- but we manage to live our lives without everyone catering to that sensitivity.