Even that wouldn't be sufficient. Look at the heterogeneity in dairy - the same amount of SFA in yoghurt has a markedly different impact on LDL-c compared to butter, likely because of both the calcium content of the yoghurt _and_ the actual molecular structure (non-churned dairy has intact milk fat globule membranes).

I actually think we need to go the other way and look at foods as foods where we have the data, rather than individual components. Most recent dietary guidelines are more "x% of your plate should be vegetables" than "you should consume x% of your energy as cereal fibre", at least in their headline advice.