By that argument, children shouldn't be writing their documents in Word, nor their presentations in powerpoint, nor using computers that contain proprietary intel micro-code in any classes.
The reality is two-fold:
Proprietary software is used universally, so learning some of it will make you more marketable later on and help you in life. Knowing excel / word is valuable because many companies run on those pieces of software to some large degree.
Secondly, it's pragmatic; there's no real viable option to using proprietary intel or amd hardware while using any computer, so we must use them.
The reality is two-fold:
Proprietary software is used universally, so learning some of it will make you more marketable later on and help you in life. Knowing excel / word is valuable because many companies run on those pieces of software to some large degree.
Secondly, it's pragmatic; there's no real viable option to using proprietary intel or amd hardware while using any computer, so we must use them.