>>2839753
Sheet bend doesn't capsize, it can shake loose or slip but it won't roll or capsize like a square knot can. Double sheet bend isn't really substantially better so if you're worried about its security then consider a locking sheet bend, a twin bowline bend or some other bend instead.

Tautline is an unreliable meme hitch that is made obsolete by actual friction hitches like prusik or blake's hitch or by trucker's hitch if you need to pull something tight.