The ending of a series can completely destroy all the meaning and character development of said series.
Or let me put it differently:
Essentially what this is saying is "it's about the journey, not the destination", but ultimately it's a pretty flawed notion. It doesn't matter how pretty the journey is if you're going to someplace to get tortured or beaten.
Also, as far as people go; you may cure cancer, but you can still suck. Steve Jobs sucked. He died a stupid death because he didn't listen to anyone about curing an easily curable cancer. Something which also defined his career, as he never listened to anyone about computers and technology, meaning his stuff sucked all the way up to the 90s.