The important part is not the message, but rather the amount of effort put into the message. Someone using this bot puts in 2 minutes of effort and no money. Someone writing a letter puts in 20 minutes of time and a dollar for envelope and stamp. Someone who flies to D.C. and protests cares a lot more.
Why? The flying protester will remember in two years. The 2 minute texter will not. The flying protestor will vote and probably work on a campaign and donate money. The 2 minute texter might vote and probably will not do much else.