there is really no need to shoot at way high ISO settings really because even if the picture is under exposed some you can boost it up in post, which will grant you the same results as if you cranked up your ISO setting..
Actually, there is great need in shooting at high ISO settings, as it saves us from spending time doing unnecessary editing in front of a computer.
Yes easier on the photographer, how ever not so good for a customer, Such as a wedding shoot.
let see, what do you think any wedding couple who hires a photographer would say if the photographer said this
"Ok now for the final part of this, Even tho you don't know what ISO is, If i use a higher ISO like 800 or even 3200, It will Make my job easier on me,
I won't have to use real good lenses that are fast and save me time on post production.
How ever the pictures will not be as high quality as if i used the lowest ISO, if Using a higher ISO will degrade the picture some depending on how high i go, if i go to 3200 you will notice color tone degraded and also a some noise in it,
You won't notice it very much if you just use your pictures for Posting JPEG on facebook, How ever if you want to make enlargements bigger then 8X10 you will notice it, Unless i use ISO 100 the lowest ISO, Which would you like me to use?"
Now you think the customer is going to say, oh use the higher ISO we don't care if our pictures are lower quality then they could be? Or you think GO with the higher quality LOW ISO shots?
After all some couples are paying very good money for them pictures, Some wedding packages are running anywhere from $2500.00 to $10,000.00
Now you think it's fair to use a higher ISO to make your job easier and give them a crappy wedding package??
that's like going to a bakery and the baker saying now would you like a good quality wedding cake? or a lesser quality cake for the same price, Keep in mind if you choose the lower quality cake, it will take me less time to bake it and make my job easier..
This is really stupid statement In terms of commercial photography.