I don't know if I am correct or not, I've never had any training, and have relied on results to help move me in the right direction, but I sharpen by "feel".
I don't try to focus on how the edge looks on the stone, I don't see that well, and instead I rely on my hands to control the angle, and the feel of the steel on the stones.
I don't count strokes either. I work one side until the burr feels like I want it to, and only then do I work the other side.
Counting strokes might cause to work one side too much or too little so I let the steel tell me when its time to work the other side of the blade.
On the flip side, I go very much by sight when judging my work. I use magnification to check my work and other devices to check my angles and final sharpness.
I don't do that for every knife, but I do check with tools periodically to make sure that what I feel is producing what I want to see.