Regarding the language of "feeling prompted" to tell someone something:
While I agree (with I think it was LHS) that to have a prospective employer use that sort of terminology would be offputting to many Mormons, it is more the context that is the sticking point rather than the language itself. Most Mormons, I think, tend to separate religious and professional contexts. Thus the employer using this language would be a kind of signal that might scare some LDS people off. (Actually the employer would be transgressing two "boundaries" here, the separation between professional and religious relationships, and the notion that spiritual inspiration should come only in relation to oneself or--in relatively few situations--through one's leaders within the church hierarchical system).
However, for Daybell to be recruiting authors through telling others about the promptings of the spirit seems less of a transgression (at least if one is already willing to believe that God gives random church members visions about important things). Mormons use this kind of "I was prompted to" do something all the time. Our previous church president/prophet was famous for committing to never ignoring a prompting and thus providing service to untold numbers of individuals who needed help just at that moment. Just yesterday in my church meeting, a speaker told of following an unusual prompting to question a friend about his spiritual health; though reluctant, he did. The moral of the story was that his friend returned to full church belief/activity because this person was willing to follow the promptings of the spirit. More generally, it is not unusual to hear stories of people whose lives were greatly blessed when others followed promptings to try to help them in certain kinds of ways.
I think Daybell was still a little more forward than most members would be comfortable with in following the "promptings," but church teaching tends toward encouraging getting past one's own qualms with regard to following promptings rather than being constrained by them. So it's not surprising that at least some LDS members are not put off by these sorts of things.