You obviously haven't fished down here in Florida then, Hydraulic JP's are a must as we are fishing many waters in the 18 -24" range with lots of vegetation. The jackplate allows you to raise the motor up and trim all the way down to get on plane or idle around without dredging the bottom with your prop. Had boats both ways and would never have another boat without one. It doesn't take long figuring out the sweet spots using the plate.
Those two alone are enough
In most cases not all, If properly set up the boat without a hyd unit will perform slightly better than with one
Adds weight to the rear slowing down hole shot a little in many cases
Takes skilled operator to take advantage of using one
Most are not that skilled In operation
Why would I want one when I can equal and probably exceed performance levels with one
Less chance of problems that can spoil your day
I stress most not all
I think the better statement is what advantage does a hydraulic unit have for my boat, absoluty none
Rough water , nope, Shallow water, nope, Hole shot, nope, Top speed, no help there either.
The only real advantage I see with one is when setting up boat it is really convenient for adjusting the P to P
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