The Skim a Ruleset tool collects the highest version of every rule in the ruleset and copies them to a new major or minor version of that ruleset on the same system, with patch version 01. Consider a skim for each major application release.
If I remember correctly, circumstanced rules at lower versions can be chosen by rule resolution if their circumstanced attributes match, even if they are at versions lower than the highest available for a given ruleset. If this is true, then might skimming a ruleset delete lower-versioned rules that are circumstanced, exclude them from the skimmed set and therefore prompt changes in application behavior if the skimmed set is say, promoted to test or production?
Absolutely not. Skimming a RuleSet includes the Base version of the Rule Instance as well as all the Circumstanced Rule Instances of the Base Rule regardless of how old the RuleSet Version of the Circumstanced Rule Instances may be.