“If this is true, that is, everyone who works on anything remotely related to computer software/hardware is working in IT, do we want to accept that the difference between CS and IT disappears as soon as a person graduates from college and enters the workforce?”
The CS guys create the programs and applications that the IT guys use.
There’s crossover, but in general that’s how I look at it. And I did indeed write a compiler in an undergrad CS class whle never touching a pivot table or a spreadsheet on my way to an interdisciplinary CS degree.