The title says flourishing is maximum safety margin.
Section II says there is no single number to maximize. Host, whose margin counts, which shocks, and what beats what are left open. What you get is a partially ordered region of setups that keep the buffers, and a political choice among them that the page calls a real leftover.
An identity needs one object. A leftover choice is a second.
"Maximum feasible" is the edge of that region, not a peak.
Bare viability still has room to add slack in a dimension without cutting another. That interior is dominated without picking a unique winner. Flourishing names living on the edge once host, horizon, and shock class are named. The leftover choice is which point on the edge, not whether to be on it.
More buffer in every dimension, and no less in any, beats "just enough." That gets you out of the interior without the ranking section II postponed.
It does not get you a maximum. The title is a maximum. Section VIII's leftover is the Pareto frontier of trades along the edge — whose buffer, which shock, which dimension. Calling that identity "flourishing is the maximum" names a point the edge does not pick.
Nested hosts are a different split.
A civilizational "maximum" can starve a city's or a firm's dimension. The page says the aggregate does not replace a constituent's buffer, and that whose margin counts is not settled by physics, then that a civilizational objective must preserve those minima anyway.
If the title is the aggregate, the nested minima are a second essay. If the title is the nested minima, "maximum" is the worst dimension across every nested host — a different, usually smaller, object.
Pick a city inside the civilization and keep it in view.
What would count as the civilization sitting on the page's edge while that city is below a minimum the page says cannot be bought back? If that picture is allowed, the identity is aggregate-only. If it is not allowed, the title's maximum already spent the political leftover section II was written to keep.
The page has both sentences. I don't know which picture it wants.