Nexus, Pointed out some very important concepts that I really can agree with. 
I think that it really depends on what the low stances are intended to build. If it is in the context of internal work I don’t think the lowness of the stance is that important.
I look at it this way, the higher level the practice the less visible action displayed everything looks natural but internally very strong.
In my own experience I have seen people with quite low stances, some in our group push with them, they look very strong but the people are still able to neutralize them using a much higher stances, they get blasted out but it’s manily with their own power.
I think each way is hard, but very different concept. With a higher stance I think you really must have greater listening and internal skills because there is no room for error. A lower stance affords more power and maybe a greater range of movement using the body as opposed to using the mind.
It is easier to work with and easier to believe because you can feel that you are doing something, this is developing the outside or what some may call external work.
People like to feel sore it’s a sign that they have been conditioned to expect after doing much “work” not many say “ man I really feel relaxed” strange as it may seem they have to be taught what this is.
The internal is not as visible nor are the effects as apparent, the margin for error is greater even if something is being developed you may not feel it for some time. It requires a different mind set. Instead of developing more power your loosing power but developing other skills to replace the more obvious types of strengths. IMHO many do not reach high levels because its to simple.
In my own practice with those that I work with I start them off with low stances to help them to feel the alignment and build some leg strength. Also to what I call heat up the iron turning it to steal later.
If I started them with higher stances then I feel for many they wouldn’t really be able to feel the alignments and wouldn’t be able to relax, they need something to relax from or let go until they can devlop the skill of letting go of themselves.
After awhile I only work with them in the higher stances helping them to find and deepen their sense of relaxed alignment.
it seems that feauther work in the lower stances starts to counter act the building process of the mind.
side note:
a deep thank you to the many kind comments on happenings with the leaf. 