One way to look at it would be that if you were shooting at 1000 yards and you weren't dead on would you want to:
- Move the bullet 5" each click or
- Move the bullet 2.5" each click???
Personally I want the finest adjustment I can have as long as the scope has the required internal adjustments that I need. I dial for all long shots and I dial in MOA or IPHY, depending on the scope, and not clicks.
The only advantage, for me, to a .5moa scope click adjustment would be the fact that I could get the total elevation change made quicker, but I've never felt that that was an area where I needed speed.
Just my personal opinion. I sure others use and like coarser adjustments. To each his own.;)