Disadvantages of planning are called potential disadvantages:
as there are advantages of planning, so can be disadvantages because every course of action, for which you have made some plans can involve uncertainties. if things don't turn out as per expectations then one can face disadvantages as well. potential means probable likely or impending so whatever are the disadvantages of planning that would be potential disadvantages....

__________________
'fa inna ma'al usri yusra.'