Specialized != Legacy != Obsolete I know lots of legacy technologies that are far from even approaching obsolescence. I know many specialty technologies that u

Specialized != Legacy != Obsolete I know lots of legacy technologies that are far from even approaching obsolescence. I know many specialty technologies that used to be mainstream. Thats sorta my point - like my industry uses 2w analog control loops with inband signaling - while this has been obsolete for new designs in most other industries, in mine its still current technology and continues to be used for new designs and implementations - if for no other reason than its a well understood easy to implement interface.