A defensible position is not a tagline or a value proposition statement. It is a specific way of seeing your market that others do not share, stated plainly enough that someone can disagree with it.
At Identity First Media, the position is this: every business needs to build its own internal media company, and that media company must be profitable on its own terms, meaning it generates new clients or direct revenue. If it does not do that, it has no business case. That is a position others do not take. Most content advice treats publishing as a brand-building exercise with fuzzy returns. This position says publishing is a business function with measurable output.
That specificity is what makes a defensible position work. It draws people in who think the same way and pushes away people who do not. Generic content does neither. It sits in the middle, offending no one, attracting no one, producing no compounding effect. Magnetism requires polarity. You cannot attract without also repelling.
Once you have identified two to three defensible positions, every new piece of content gets measured against them. Either it reinforces one of those positions, or it is generic content that dilutes your signal. That is the only filter you need.