So much needless discussion because someone makes an ill thought out hot take. Most engineered objects of any substantial complexity include built in test systems. They would be impossible to build without them.
In-situ fault testing and isolation is an engineering principle that per pervasive across many domains. You want your auto manufacturer to rip anything related to tell you why it doesn't work?
You are just trying to defend a previous opinion by throwing out some acronyms to dress up your argument.
They should spin two boards, one with jtag and one without and then how would they debug the board they just removed the jtag on?
All systems are dynamic, all reliable dynamic systems use feedback, but you are arguing that engineers would rather remove those feedback mechanisms?
