Personally I think that if we have morphs than they:
1. Have to be influenced by multiple attributes - the at last 3 attributes for every morph, for example musculature has to be influenced by strength, endurance, and agility at high level. Maxin only one of thous attributes woun't make you to muscular, but all 3 at 100 will. The same for weight - speed, agility and personality, you can still be charming and quite chubby, or agile and soft around the edges, but supermodel with Olympic gymnast agility and sprint runner speed will be quite thin.
2. Morphs have to depend on the body type.
3. And the most important - the maxed out morphs for every body type have to look
godlike good as in design in mind, not just "lots of everything" like it was in Fable. If all your
attributes are at 100 you have to look like a magical vision of perfection, not an ugly mismatched troll. And still retain the overall body shape you selected to begin with, don't make Conan out of Altmer please