I would like to say that most of what you are pointing out doesn't have that much to do with only the health of the plant. There are many other factors besides the health of a plant. Take two very healthy people for example. One has a predisposition for full hair, the other is going bald by high school. Can you really look at the two people and tell me which one is in better health? Hell no! Why is it we always here of the super healthy triathlete who dropped dead of a heart attack? He looked so healthy on the outside.
Nowhere in your list did you mention one of the most important signs of plant health......the stem color. If the stems are green, the plant is up taking nutrients. When the stems start to get discolorations like purple or red striping, the plant is not absorbing the necessary nutrients and therefor is not healthy.
The number of blades on a leaf has nothing to do with health. Sativas have narrow blades, allowing more blades per leaf. Indicas have fat overlapping leaves, usually around 9. Some of my most vigorous indica cuts only have 7 blades. Most plants we grow these days are a mix of both indica and sativa, meaning any number of blades can show up on a leaf, in varying lengths and widths.
Not all plants grow fast just because they're healthy. I have a few very slow veging crosses that like to take their time in veg, but turn into monsters in the bud room. Plants grow at different speeds, depending on the grow medium, light source, available co2, humidity, and nutrients. If you grow organic, your plants will grow slower than DWC with mad chemicals. Hydro and CO2 cause super fast growth.....that doesn't mean the organic plants are any less healthy.
Side branching fans will only have 7 blades if the plant is aloud to grow to a certain size. This can be said about most mj plants. It's a lighting thing. If you grow a plant under a 40watt t8, your fans may only have 5 blades and your buds will be small and airy. Under a 1000w MH, the same plant may have 9 blades and yield 5 times as much, simply because there is more light. Less light does not mean less healthy....it means less photosynthesis leading to less growth. A plant grows in direct relation to its environment.