There seems to be a lot more language (specifics, details, requirements, exceptions) in the NCAA Rule Book than in the NFHS rules, that tends to allow more judgment, more flexibility and more discretion by NFHS officials. Perhaps that's because NFHS games and competition is far more localized (Sections, Communities, States, Regions) than the NCAA National perspective.
Often you won't find the rigid, specific and detailed requirements in the NFHS Rules that exist in the NCAA or NFL versions. Perhaps that's a reflection and response to the significant differences in maturity, physical attributes, playing level objectives and capabilities and experience differences between the participant universes at the different levels.
Because of those differences, and the overall objectives of different levels (learning and development versus performance) are uniquely different in many aspects. Contact versus Non-contact seems a somewhat obvious difference, that NFHS relies on the judgment of the individual official somewhat more so than other, more nuanced levels.
A better definition, from the 2018-19 Game Officials Manual (Basic Philosophy &Principles) suggests; "While a thorough knowledge of the rules is important, it is not enough to guarantee the competency of a game official. There are other attributes that are equally important. Game officials must possess a combination of these if they are to fulfill their duties adequately. In addition to complete mastery of the rules, game officials must have a good knowledge of human nature and the ability to control situations as they arise. Football is a game played by physically sound athletes blocking and tackling each other. At times, the emotions of players, coaches and crowds run high and game officials must control themselves in order to provide necessary leadership."
Doing so effectively at the NFHS level is aided by the flexibility provided to apply the intent of the rules to the specific situation being observed, rather than adhering to a rigid, universally intended, specifically detailed interpretation of absolute directives. There are differences, which are intended to support the inherent differences of the playing levels, which will likely NEVER apply to every incident exactly the same, and rely on the judgment of the game officials to produce the appropriate results. .