Great picture of the anchors Maine hanging in the splice
A lot of electrical equipment comes new with a short run of wire for example VHF. mascerator pump, diaphram pump etc usually has a 4 ft length of wire so you have a choice if your run is 15 ft to the back of the panel. You can properly butt splice the two wires which came with the unit meaning heating shrink as well or you can take all the wires off and run 2 continuous wires to the panel, except you have get to put the inline fuse and splice the positive side anyway.
Properly done as you said its just as good an install. I dont go out of my way to use them, but there are times when it only makes logical sense,