Any proper Dominant would be able to detect when their submissive partner was uncomfortable w/certain aspects of play.

Except for the part where nobody is psychic, and if you expect a dom to know instinctively you're setting up for situations like what Kynn is claiming, where a person misses the cues and then claims they never existed. Communication and safewords > magical domly powers.

Further, someone can be a great dom and have trouble reading cues. People with ADHD and on the autism spectrum often have troubles with this, regardless of their experience with people or their intentions, and to tell them that they cannot be a "proper" dom because of that is cruel, and frankly kind of ableist, and I'm really sick of people acting like if you're better at detecting subtle changes in moods that you're somehow better than people who aren't. The important thing is being open to communication, encouraging it, and learning from it, and that's what we need to stress for people in relationships of any kind.