I've been working on stretching while in a 103 deg F whirlpool path. Heat increases the plasticity (long-term stretchability) of muscles and ligaments.
For a person with high flexibility, what I do might be terrible, because heat lets you stretch all ligaments as well as all muscles. I also hold the stretches for long periods of time, which some people say is bad, because they are in danger of stretching the ligaments that hold their joints together.
But I have very poor flexibility, and am in no danger of over-stretching anything, muscles or ligaments. What is more, for an inflexible person like me, most muscle stretch positions do not stretch ligaments, because muscles are what limit me. But most of you great skaters are super-flexible, and need to avoid over-stretching the wrong things.
Some experts try to diagnose exactly what muscles you need to stretch to do what you want, then have you exercise those specific muscles for a while to get them warm, then stretch them. A good sports medical professional, like Rsk8d (I guess), can look at your body and what you want to do with it, and figure out exactly what you need.
Someone else's "custom" stretching routine may not give exactly what you need, just like someone else's "custom" boots or gloves or dresses may not fit you. "Custom" doesn't mean "One size fits all".