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Upgraded /execute if command

The /execute if entity command could be extended with a new functions like …if entity @a use=minecraft:harness or …if entity @a sneak for example. That would make adventure maps or Mini Games much more simple and lag-efficient. It also can be used as a method of making datapacks more user-friendly for example: sitting Datapacks, you don’t need to execute /trigger sit by adding a feature to the pack for holding sneak for 3 seconds to automatically sit.
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    sneaking detection could be done now by creating a predicate (e.g. example/predicates/sneaking.json)

    {
      "condition": "minecraft:entity_properties",
      "entity": "this",
      "predicate": {
        "flags": {
          "is_sneaking": true
        }
      }
    }

    and calling

    /execute as @a if predicate example:sneaking run …