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Re:Professional Software Development by sontek on Sunday January 27, 2019 @10:40PM (#19015197)
Obsolete means to no longer be produced or used... These things are not obsolete.

They aren't cool / widely used but definitely not obsolete if half the worlds financial systems still run on them.

Re:Professional Software Development by dtech on Monday January 28, 2019 @06:32AM (#19016651)
From merriam webster:

    1a : no longer in use or no longer useful
         // an obsolete word
     b : of a kind or style no longer current : old-fashioned                 
         // an obsolete technology
A good example is a satellite, lots of older (obsolete model) satellites are still in orbit and performing well, and replacing them is not worth the cost. But if a new satellite is needed the newest model will be send up, not the obsolete model.