If you don't understand rigging you're just making a dead object full of flaws and pass it off to someone
who gotta keep throwing corrective morphs at it in a desperate attempt to save your poorly executed work.
The correct physiology of a character is a product of the foundational mechanical system that is it's skeletal frame.
When you design something and attempt to retrofit this as an afterthought you'll run into the type of trouble you describe.
And solwing that is very unglamorous, because it can't be done right and a lot of artists go trough life doing it poorly.
But rigging's glamorous to men who do it well. When you're rigging, it's life. Anything that happens before or after is just waiting.