"He didn't send the letter. The lawsuit was dropped."
"He didn't send the letter therefore the lawsuit was dropped."
Two very different examples. "therefore" in the second example communicates a causal effect from the independent clause that isn't present in the first example.
I'm sure one could argue that context clues could imply that same connection and therefore "therefore" is redundant but I just don't agree with the premise.
"He didn't send the letter. The lawsuit was dropped."
"He didn't send the letter therefore the lawsuit was dropped."
Two very different examples. "therefore" in the second example communicates a causal effect from the independent clause that isn't present in the first example.
I'm sure one could argue that context clues could imply that same connection and therefore "therefore" is redundant but I just don't agree with the premise.