Some of the best tutorials I ever did both showed how they did something specific and explained WHY they used that method and how to get there from basics. It makes for a longer tutorial, and I do tend to go do my own thing for a while while experimenting. (This wasn't for Poser, it was for something else, but the basics of how to make a good tutorial applies, no matter what you are teaching.)
Like "step 1: working towards making the back ground have this particular texture." Then an explanation of some specific item or tool used, and then shown how to use that tool to get that specific effect. With maybe a sidebar on some other interesting feature that also works really well along the way, or a list of suggestions of other things one could try to do other things of a similar type. This both shows a specific application AND shows a general principle. The combination works much better than either standing alone.
At least it does for me. But then I'm the type of student who does not follow spoken lectures. (Not well, anyhow.) I have to understand it, I have to see it done, and then I have to do it myself. Otherwise, I remember nothing.
I learn similarly. I need some insight into the process that lets me understand what I’m attempting to do, and then I need to try it given what I know.
I just don’t want to belabour unnecessary details. And, truth be told, I might not fully understand all the techno-whatsits behind how Poser does something anyway. I just need it to do what I want it to do.
Ultimately, the answer to why won’t be technical, it will be “so you can do things like this”.