I know it was just an example however any competent blink user would of noticed that you also began your jump before they enter their blink. That information paired with the radar would allow them to find you near instantly. Now on inferno game types you have a point. Blink isn't just limited to that though. It also allows you to escape and reach favorable positions unlike any other jump can. Pair this capability with tlw and your opponents are going to have a lot of tears.