Certain theories were written in context to some aspect in specific and was applied across different aspects. Finally they didn’t suit few and suited few others.
Certain theories were written to please people and not lead them to success. They were written to accommodate and justify failures, reasons. Weak mindedness etc.,
Certain theories were written with limited knowledge and exposure, i.e, out of ignorance.
Only few theories were sustainable and applicable everywhere. Knowing these, validating these and accepting them is a herculean task with lots of implementation challenges too.
Which theory will you want to follow and why?