Complexity knows only one direction: Getting more complex
Complexity, in general usage, tends to be used to characterize something with many parts in intricate arrangement.
Wikipedia
Following this disambiguation, and assuming that “many” means N > 2, all systems with at least two or more components are complex. But that would be an exaggeration, right?
Why is information technology complex? Most systems in information technology (IT) are complex. Almost everything we are working with, consists of two or more components, regardless if it is hardware or software.