i can answer that for him:
Sometimes you need a certain view for what you are doing.
The correct question is:
Why not just enable this function in icon view as well?
But then Apple hasn't been able to make sensible changes to the finder for nearly a decade, now, so I wouldn't expect that to change any time soon.
instead of useful, customizable viewing options, copy/cut/paste and a whole host of other things, we get coverflow for files. Gee, thanks. Now the other people in my office can take what I do even less seriously than they already did.
PC-using Boss: "Just cut and paste the files you want onto that server"
Me: "Actually, I will have to copy and paste, then go back and delete the files in a separate process."
Boss: "Macs are for children"
Me: ...*sigh*...