Sure, you could sum up a lot of Walter White's character arc with the following:
Except that's not what he's saying.
You're being pretty dismissive of different points of view on this thread.
If I don't think a shoplifting subplot did much for Breaking Bad, then I must not like character studies.
If Gled thinks Walter White's journey doesn't merit a five-season treatment, then he must be saying that his motivations are a single, not terribly representative sentence.
Come on, man.
Walter White's journey was largely about the mask he wore -- even with himself -- being torn away and realizing that he
liked being a ruthless criminal. The people around him clung to their illusions, even once they had hints that something was happening, first because the truth was hard to imagine and then because doing so was a form of self-preservation for their identities or worldviews.
I think that could be shown, including every iconic moment from the series (the body being dissolved in the bathtub, the disastrous cooking in the RV, Gus getting his face blown off, Hector banging on the little bell, Walter's betrayal of Jesse leading to Jane's overdose, "I am the one who knocks," the wild final days of Walter and Jesse's imprisonment) in less than five seasons. It would change the pacing of the series to more a rat-a-tat-tat of moral decline, so it would be inherently different, but it would definitely be possible.
That said, if you genuinely think every moment of a five-season television show was fantastic and needed no cuts, then I'm both amazed and, frankly, jealous, because I can't think of any media that I feel that way about.