Fillers are usually a sign of sloppy writing, so no need to use them.
But even technical articles may be accompanied with deeper insight, typically with discussion of pros or cons of the given approach.
A longer article helps understand its reader not only what its author intended to convey, but even why he claimed that.
Of course, if the author's intention is only to provide a quick tip, no wordiness is necessary. But on the other hand, such write-ups usually do not qualify for a full-fledged blog article.
After all, some readers may end up disappointed that they got caught by too short note-like work, not exactly worthy of the click and wasted data.
Moreover, it is said Google Search Engine tend to skip over too concise content, so the author gets disqualified from the global competition.
Chris Bongers
Pavel Morava
1500-3000 words
They say about 1k is enough to satisfy Google, but personally, I would recommend 1.5k as the bottom line.
Actually, 1.5k words are the required daily minimum for writers of Chinese Online Novels if they want to get paid. I guess the Chinese companies (Webnovels and others) have their well-researched reasons to insist on this number.
Over 3k words are simply too much. Modern readers need a break to relieve their shorter attention span.