Ever since the reign of Queen Victoria and the royal acquisition of Balmoral, it's become expected that each successive monarch spend time working to improve the estate.
Yes, the "Balmoral Test" is a real thing, although not something explicitly talked about, according to Andrew Morton's famous biography of Princess Diana. "Those who successfully navigate the social minefield, popularly known as the Balmoral Test, are accepted by the royal family. The ones who fail vanish from royal favour as quickly as the Highland mists come and go," Morton wrote.
Outdoor activities are the name of the game at Balmoral: The Crown accurately depicts traditions of hunting, deer stalking, hiking, and so on.