The only ones that long primaries aren't necessary are for those beers that are low in abv, or are meant to be drunk young and or cloudy, like heffes...
The rest of them, including your stout, I believe benefit from a long primary.
Since I don't brew heffes, I leave all my ALES in primary for a month, unless I'm adding hops, fruit or oak, then I rack at about 2 weeks into a secondary...
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