"The number of IBM employees has fallen to its lowest point in six years, with 350,600 global workers at the end of 2018 -- a 19% reduction since 2013." Why do

"The number of IBM employees has fallen to its lowest point in six years, with 350,600 global workers at the end of 2018 -- a 19% reduction since 2013." Why do they still have such huge numbers? Can't they make the company work with just 10% of those?