Again, what you are saying is the equivalent of "if you don't want your sink to overflow, make sure less is coming in than is coming out". It says nothing of value.

If you just blindly go into a caloric deficit, without taking into account any of the hormones, your body might not burn what you want (say, for example, muscles). It will also fight you at every occasions and slow down your metabolism, meaning you'll have to be even more in deficit and feel like crap.