Items in your list are what I’d call soft, endogenous drivers. All result in some adoption through word-of-mouth. “It’s easy, you should do it too!”
Another one:
- Make it visible who made the last update.
All of which assumes we want & need a curated registry (early Yahoo!) vs an index (Google).
Missing in your list are the hard, exogenous drivers that resonate with institutions. “We should make this a stated duty in a staff position because…”? A significant reason for inactivity of collections in maintaining their metadata is simply staff turnover, not attrition or secession. Former staff did not inform new staff; it wasn’t an institutional requirement to communicate the importance of that task. So…what would make it a top-of-the-list, institutional requirement?