I'm sympathetic to those who see efforts like ours as a distraction from party building. If your numbers are low, and you don't have enough functioning people to staff basic party positions, then you are wise to fill those positions first, and do community service projects out of your precinct organizations if you have the energy to do that.
We are not in that situation in Durham County. We are not tripping over each other, but there are enough people doing good work in both the party and non-party organizations that we do not think we are practicing fratricide by organizing outside of the party. Not everybody loves the Democratic Party, and people who are willing to help it for tactical reasons might prefer to have some separation between their efforts and the official party. Also keep in mind that our avoidance of electoral politics is both helpful in terms of being able to do some things that the regular party can't, and also causes people to think -- if only for a moment -- about the implications of a political organization that does not do electoral politics.
Partly as a natural outgrowth of not doing electoral politics, we are neutral in all local party fights. We don't take sides, we don't belong to anybody, and nobody belongs to us. As in lots of other places, the Dem party here has a tendency to form factions, and we see ourselves as glue rather than as just another faction.