There’s amazing and terrible manuals everywhere. One of the key things is defining target audience. From there you define experience and knowledge.

If a manual is intended to be for a broad audience interacting with something new, then you use the lowest level reading level that still makes your point. From there you work on flow because there’s a 1000 ways to skin a cat.

If LEGO manuals were only written step by step instructions, at a college reading level, then they miss a key demographic. Yet, people would still walk around like “That’s a perfectly cromulent instruction manual!” Technically they would be correct but it misses the point.