I use it for 70% as it's my preferance, I like having full control over what settings i use.
All a personal choice but seems like a colossal waste of time and a recipe for failed photos.
If I am shooting some generic subject I don't care if the shutter speeds 1/300thor 1/400th so I'm not going to waste my time worrying about such trivialities and will simply pick the aperture to achieve the desired DoF. Its not about having full control, it is about concentrating on the task at hand.
I have a thermostat in my house which I like to use. Of course I could manually switch the heating and AC on and off when ever I'm too hot/cold but really, the thermostat is going to be much easier and I can concentrate on drinking beer and watching Game of Thrones.
Of course I may be after a specific effect and want a slow shutter speed and thus shutter priority comes in to its own.
And I only say this because my photography improved a lot from simply enabling auto-ISO. Now I can have the viewfinder glued to my eye and concentrate purely on getting a good composition and correct DoF rather that keeping an eye on the shutter speed and ISO.
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