I'm willing to go to considerable lengths to eliminate character delay - when the things I type don't show up on the screen instantly, it becomes harder to think in a painful way. That's an idiosyncratic reason, but it's there.
At the higher level, you're composing some tricky unix pipe, and at the lower level, you're counting many backspaces you've pressed and how far behind the echo is.
% find . -name '*.txt' -mtime +2 -exec chmod g+w^H^HUsing ^W can alleviate this.