No, it's a truly meaningless word. Try it. Take any sentence with "arguably" and remove it. The sentence is unaffected.
"Eric S. Raymond is arguably the craziest man in America."
"Eric S. Raymond is the craziest man in America."
You might say, oh, the second version is stronger. But that's exactly what the first version is saying too! It just inserts a filler word to keep you distracted from its flat-out claim.
Someone or other who knows their shit noticed this, not me. I forget who it was, though. Someone Smarter Than Me when it comes to English, and that's hard to find.
"Eric S. Raymond is arguably the craziest man in America."
"Eric S. Raymond is the craziest man in America."
You might say, oh, the second version is stronger. But that's exactly what the first version is saying too! It just inserts a filler word to keep you distracted from its flat-out claim.
Someone or other who knows their shit noticed this, not me. I forget who it was, though. Someone Smarter Than Me when it comes to English, and that's hard to find.