"Crutch" original meant the singular method of one's ability to succeed. In Halo, there were a few wannabe MLG guys that seriously leaned hard on a sniper, and focused on those no scopes with a passion. Unfortunately in a game like Halo, snipers spawn on the map with a limited number of rounds, so if that is your crutch, it is going to be a rough game. Now, in Destiny the term refers to whatever the person essentially spams on the map to succeed. For example, if a titan has the bewbie exotic chest with fusion grenades and simmering flame, and wouldn't you know it he is not touching his super and getting sticks left and right, then guess what? By Destiny's standards, stickies are his "crutch". Hell, I use flux grenades because they are effective. Unfortunately no armor piece or ability allows me to spam them as much as titans though, so I have to focus on other areas in order to drop fellow guardians. Not complaining either way because, to be honest, I don't really care either way.