in reply to
A Porting Horror Story
Great post. Something like this probably qualifies as an axiom: "understand why you want to rewrite something, and understand what you may be rewriting".
Another issue that I haven't seen touched on yet is the new CTO's ego and political motivations. I would guess that if a new CTO just came in and shot par for the course by keeping the legacy system running well, that CTO wouldn't have much to add to their resumé. It seems like it makes more slimy political sense to say "Everything sucked until I came on board and made it better"; especially if it's not true.
"A Jedi uses the Force for knowledge and defense, never for attack."