Dan's point was that they would want to have the same number of package segments in all the interceptor definitions. I don't think that they will ever achieve this, as they might pull in a third-party interceptor, or define their own, which isn't in a place with the same number of package segments.
Well, naturally, we can't control everything. I was just thinking for our own sanity, within Seam, we could ensure some sort of consistency.
Arguably, it's not the number of package segments that matters, it's the entire prefix (for readability).