Corpus consensus
10 cooks, no dissent
The identity of the liquid is close to free
Substituting a different beer style (IPA, stout, dark lager), red wine, or beef broth for the called-for beer all still deliver good richness.
This is a rare thing to be able to say with confidence.
A single cook reporting "I used broth instead of beer and it was fine"
is an anecdote and nobody writes an article about it. Ten of them
saying it in passing, across different recipes, with nobody reporting
the opposite, is a finding. Whatever the beer is contributing, it is
not something these cooks could detect the absence of.
What to do: use what you have. If a recipe calls
for a specific beer you do not own, broth is a documented substitute
and not a compromise you need to apologise for.
What does move it
4 cooks across two claims
Quantity is not free at all
Using noticeably more beer than called for (1.5 to 2 full bottles instead of about a cup) raised richness to 7-8/10.
Substituting a different beer style (IPA, stout, dark lager), red wine, or beef broth for the called-for beer all still deliver good richness. Read those two
together with the swap finding and the shape is clear: pouring in more
of a concentrated, slightly sweet liquid raises richness, and it barely
matters which one it is. That is consistent with concentration and
residual sugar doing the work rather than any particular beverage's
character.
What to do: if you want a richer pot, use more
liquid of the kind you already chose — then reduce it back down.
The gain is in what you concentrate, not what you opened.