The gang at Famitsu had the chance to talk to numerous developers who were involved with Hyrule Warriors: Age of Calamity. That includes Nintendo's Eiji Aonuma, who was asked if he gave the Koei Tecmo team any strict/specific rules to follow during development. Turns out he didn't feel the need to, as he trusted them after seeing what they did with the original Hyrule Warriors. You can see his comment on the matter below, as translated by NintendoEverything.
The degree to which the Hyrule Warriors team understands The Legend of Zelda left me feeling confident they could make a game as strong as the first Hyrule Warriors. Because of that, I didn’t have to ask them to do anything in a specific way. And once again, I was blown away by the result.