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Figure below shows some config dependencies - A effects B and C, each of which effects DE and FG respectively.

Now assume user changes B to B' - a call to /recommendations will only change D and E to D' and E' respectively (AB'CD'E'FG). No other config will be changed. Now assume that C is changed to C' - /recommendations will only change F and G to F' and G' while still keeping the values of B' D' E' intact (AB'C'D'E'F'G'). Now if you change A to A', it will affect all its children (A'B''C''D''E''F''G''). The user will have chance to pick and choose which he wants to apply.

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