I've installed and replaced dishwashers before, and it seemed relatively simple... Until! Until I installed a "tall-tub" dishwasher, a Whirlpool. It seemed all were going to "tall tub" design. Tall tub just means the inner tub extends down lower, leaving almost no room for the motor underneath the tub, and no room to connect it all up!
I had a devil of a time with it. Both water and drain were coming in from the right rear from the sink cabinet, and the D/W wanted them in left front. There was no way I could use copper tubing with a flare fitting like I usually do. I had to use the flexible metal braid-covered plastic line the whole way. And the drain line was a real pain to run too. Trying to lay them out and walk the machine in without running over the lines with the motor or D/W frame or something else was real tough. There just wasn't enough room for the lines under there. The motor comes within a fraction of an inch to the floor.
Wasn't comfortable with those plastic lines laying on the concrete floor, or going through sink cabinet wall cutout unprotected. Concerned that the water pulses with flow could over time chafe the lines. So I slit pieces of auto heater hose, and slid them over all contact areas. Still don't like the idea of a flexible plastic water supply line under there that is always pressurized, metal braid overlay or not. But no way could I get copper tubing to fit, route, and move back into place when sliding the D/W back.
And "tall tub" also means us tall folks now have to bend over FURTHER to reach the bottom rack