You could also say life is too short to waste time retying inferior drawstrings. If learning the knot takes 5 minutes, it seems like it could easily save you time overall.
I've been tying shorts for more than 35 years. I can do it with my eyes closed. I can do it while running, or while swimming. I don't need to look down, finagle an end into an ampersand and whatnot. I don't have to worry about grabbing the right loop+end combo to increase or decrease tightness. I just undo the knot, and redo it according to preference.
I'd argue I'm just about as fast adjusting my shorts than this guy in the video.
If it takes 5 minutes to learn, and if you have 30 more years of needing to tie drawstrings, and you need to tie on average one drawstring per week, you will come out ahead if it saves you 0.19 seconds tying or retying per drawstring.
I haven't tied a drawstring or used a belt in maybe 15 years, when I realized it was worth finding clothes that fit well. They're more comfortable and look better.