Simply because the fine focus moves too quick to get the object
focused. Chances are you will miss the focus point.
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Quite simply,YES!
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Most would say the Focus is better simply because it is more
well-known, but everyone can have their own opinion.
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Species do not focus on anything. They are not agents capable of cognition or focus. They are simply groups of organisms. It is organisms that focus on things, if they are capable of it.
Organisms, in order to ensure their survival, need to focus on:
Approaching traffic when crossing roads.
People with sharp sticks.
Angry ex-wives.
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I don't know if there is actually any training that just focus's
on that, but you could go to computer classes. Or you can just
simply go to Wikipedia, or websites that focus on that.