A team is small. Mixed discipline. Product owners and designers on one side, engineering on the other. On paper it looks balanced. In practice it isn't close.
The upstream side of this team produces scope continuously. Wireframes. User stories. Research findings. Feature requests. All of it funneling toward engineering for execution. But the engineering side has a bottleneck that doesn't show up in any capacity model: one person who understands how the backend actually works.
Every feature, every fix, every integration has to pass through that person. They are also training a junior teammate, which consumes roughly a third of their available time. The mentorship is necessary. It is also invisible in sprint planning. Commitments assume full availability that doesn't exist.
Research across 300+ organizations puts a number on this pattern: 20–35% of value-added collaborations come from only 3–5% of employees. The helping burden concentrates on a few people, and planning systems don't see it happening.
The upstream-to-execution ratio is heavily skewed. Multiple producers generating scope for a fraction of that capacity in engineering output. The team creates work significantly faster than it can deliver.
Then there is the leadership layer. New requests appear without warning. Features that aren't on any sprint plan land in the engineering queue because someone with authority gets interested. Whatever informal prioritization the team has built gets regularly overridden from above.
There is no intake filter. No scope governance. No delivery cadence. No structural mechanism to say "not this sprint" to anyone.