Originally Posted by chauncey
Yeah thats what I was getting at, seems like the greater distance could lead to presentation issues when casting across multiple currents. Sorry for the confusing post.
It is not the hauling that is the problem. It is choosing the wrong position from which to cast, which then results in casting across varying current seams.
Double hauling actually helps in casts to reduce drag. The bounce cast is one method and to do the bounce cast you put excess energy into the cast, hence the advantage of a double haul.
Reach mends require a bit of line shoot to place the fly in the right place. The mend which is on the diagonal is always longer than the direct path to the target. A puddle cast and a pile cast (pile cast is a tuck cast done with a bushy dry fly) also require some excess energy and/or line shoot.
The ability to add energy to the cast with a proper amount of haul is never a disadvantage. Consider that if you are in the situation that you cannot get closer to a large feeding fish. If you going to catch it, you must make a long cast. To add slack to the cast, you need to be able to put extra line into the cast to provide the cast. A double haul allows you to add extra line into the cast to provide a longer drag free drift.