I think it's just as easily a sign that you might have too much or too little of a marketing department. Too much marketing influence and they create busy work for themselves like rebranding your existing products every year or so to keep them "fresh". Too little marketing influence and engineers are free to build unmarketable products without clear brands or focuses, and (closer to hand to this discussion) free to ignore the built-in good will and momentum of maintaining existing brands and products.

Sure, it's easy to blame engineers for focusing on new shiny ideas and only wanting to work in fresh codebases and "new" products, but it's just as much the fault of their management and the company not trying to adequately control its own brand(s) and how its users perceive it.