Using modern communication system to propagate the Gospel is because both God and His Word are great. The preaching of the Gospel does not have to be done in a corner like Saint Paul stated in Acts 26:26.
Brother Eli travelled to Areopacus and stood on the mount where Paul stood, calling on the men of Athens to hear the word of God. This shows a great commitment on his part. He even went into the temple near that place. I wish I was there with him.
The modern means of communications like Internet, satellite, radio and TV have truly opened the channel to preach the gospel to all nations. This is unlike the old fashioned door-to-door approach which is more tasking with little to show.
Whoever that does not want to embrace modern innovations has decided to remain in the past.