I went through F3 missing two things about hacking:
1 - that brackets trick you can use to remove a wrong word
2 - that you could just stop hacking with one guess left and immediately start over with full guesses. I never tried it since it made much more sense to me if you were stuck with your guesses. Otherwise what's the point? If you can just start over again and again there would be no challenge. Turns out that was the design all along.