I agree with your point, and so do in fact many EA organizations as well: e.g. different charity evaluators tend to recommend organizations that only have a small set of (well researched and evaluated) concrete interventions—usually these are designed for a very particular location / community / target audience. Naively scaling interventions to e.g. very different countries indeed often does not work that well, and would oftentimes lead to much lower (cost) effectiveness.
I agree with your point, and so do in fact many EA organizations as well: e.g. different charity evaluators tend to recommend organizations that only have a small set of (well researched and evaluated) concrete interventions—usually these are designed for a very particular location / community / target audience. Naively scaling interventions to e.g. very different countries indeed often does not work that well, and would oftentimes lead to much lower (cost) effectiveness.