In all my years I've never seen a complete rewrite (i.e. a "cleanroom rewrite"), but I've seen many systems and subsystems evolve over time (usually in the same

In all my years I've never seen a complete rewrite (i.e. a "cleanroom rewrite"), but I've seen many systems and subsystems evolve over time (usually in the same language) which eventually, one has to ask "is this the same software?". Most software that's been around a long time is generally a Ship of Theseus.