The sentence that would weaken the writer’s argument if they chose to add it is:
"People who make a big fuss about preferring physical books need to get over themselves."
This statement dismisses the validity of physical book preferences, which could undermine the argument that e-books should be supported for their accessibility and benefits. It suggests a divisive attitude and could alienate those who appreciate physical books, rather than fostering a more inclusive discussion about the coexistence of both formats.