Absolutely. This is why still so much COBOL code around. A lot of it 'just works' so 'dont fix what isnt broken' comes into play. And a lot of it, and Fortran, is so intermingled across huge systems, that nobody has any certainty of the impact of touching it.

My opinion is the technology used for the most successful and robust back-end systems will remain long after Im gone, while that which is purely for the HMI will continue to be as fluid as it is now, simply because behaviour evolves based on individual and institutional retained knowledge.