I have asked a lot of questions on coordination chemistry here before and I have gone through a lot others here as well. Students, including me, attempt to answer those questions using the concept of hybridisation because that's what we are taught in class and of course it's more easier and intuitive than crystal field theory/molecular orbital theory. But almost all of the times that I attempted to use the concept of hybrisation to explain bonding, somebody comes up and tells that its wrong. 


This is a link to one such question and the first thing that the person who answered it says-"Again, I feel a bit like a broken record. You should not use hybridisation to describe transition metal complexes."

I need to know why is it wrong? Is it wrong because its oversimplified? Why does it work well while explaining bonding in other compounds, what goes wrong in the case of transition metals?