why is it 'and not' instead of 'than'

Test Preparation SAT Preparation
1

<p>For many officer employees, e-mail is thought of as more of a burden and not a help in expediting communications.</p>

<p>Can someone explain to me why ‘than’ would not work in place of ‘and not’</p>

2

<p>Both than and and not would be grammatically correct there, but their meanings are very slightly different (certainly not different enough to be directly tested on the SAT writing though). </p>

<p>The way it’s written now, email is being described as two things: “more of a burden” and “not a help.” It is not saying that it is “more of a burden and less of a help,” it is simply saying it’s “more of a burden” and also “not a help.”</p>

3

<p>Personally, I would choose “than” or “rather than,” as you’re contrasting “more of a burden” with “a help in expediting communications.” “And not” would make is sound redundant.</p>