Like when you DB flies, you get the stretch. But there is no tension during the top part of the adduction, so you need pec dec to pull sideways and get the final squeeze.
Or when you do lateral raises with DBs tension come off at the bottom so you use the lateral machine to get sideways resistance out of the bottom.
I know I seem argumentative, but this is a machine that was invented to make money for the company.
A far superior method of doing lateral raises is kneeling between a cable crossover machine using the bottom pulleys: starting position is your arms crossed. This is much more stretch than any lateral raise machine. I tried a couple different lateral raise machines once (only). It is pretty much worthless compared to the cable crossover machine. My delts grew the most when I discovered that use. It was my second shoulder exercise following a heavy barbell press (either front of behind the neck.) My delt appearance totally changed my physique. I always thought the dumbbells fell extremely short because the delts are never stretched.
Perhaps I suggested these exercises because they are the heaviest exercises that can be done for the target muscle, not because they uniquely target the lats?
Any exercise that is easier to lockout, or finish at the top, is a good candidate to employ accommodating resistance. For staying with weight (force due to gravity) use either chains or reverse bands.
Good exercises:
Squats
Deadlifts
Barbell bench press
Most all barbell presses
Scott barbell curls (if for safety reasons alone)
Most lat exercises are poor choices because you tend to begin the pull stronger than you can contract at the end of the pull. Accommodating resistance makes this worse.
Squat for example. You can perform 1/4 squats with much more weight than you can squat deep. Imagine doing 1/4 squats with 500lbs, but as you squat deeper the chains lie on the ground and the weight gets lighter the deeper you go. Now you have the ROM of a deep squat with the weight getting heavier as you approach the lockout