It's just better for adding the sleeve stitches where you are going to work them in the opposite direction later. I do not suggest using it for the initial cast on. When the pattern does not say what kind of cast on to use, it means it is your choice. And the long tail cast on is frequently my choice.
Of course even when the pattern suggests a cast on, you can still use a different one if you prefer. The pattern suggests using the cable cast on across the back of the neck and at the bottom of the neck. But the knitted cast on would work well also. The backward loop cast on could also be used, but I don't like using that one myself. The pattern does not suggest a cast on for the 3 or 4 stitches cast on at the front of the neck either. But I always use the cable cast on. It is a stable cast on with some heft to support the neckline when you pick up stitches later to work the neck ribbing.
By the way, it's not only cast ons that you can change. In fact you can change anything you like! I encourage you to add color changes, fair isle bands, a lace edging, cables, an all-over stitch other than Stockinette, or anything that you like. Then the pattern becomes a basic template as a starting point for your own design.