I personally don't think 16GB is enough, but the article is just an unsupported click-bait rant with no supporting evidence.
"struck sour for even some of the company's biggest fans" - not just any fans, "biggest" fans.
"But it suffers from some skepticism about its long-term prospects." - from the author no doubt.
Having a 16GB phone is "... just a vague hedge against eventual future bankruptcy." WTF? How can you hedge against an "eventual" bankruptcy?
"That's a somewhat understandable impulse for an incredibly successful company that actually experienced a near-bankruptcy back in the late 1990s." Yep, they're acting on "impulse". Can't even be specific about the date - sometime back in the... 1990s?
A thoroughly researched article with a well reasoned and persuasive argument.