Hi! I want to preface this by saying that I mean absolutely no disrespect; nothing but support to my fellow artist, your style is unique and valuable and that doesn't go unappreciated!
With that being said, I really do not think this technique should be relied on for beginner artists. The individual parts are there, but with fundamentals it's REALLY important you understand how they're put together; they serve as the basis for everything you draw and getting to know them right can save you a TON of hardship in the future!
It's also worth mentioning that the sad truth is that neither of these techniques are gonna take you only fifteen minutes if you're drawing anything other than a sphere haha, but I really enjoy the process personally! Everything's made out of shapes, so put on a video essay about some game you've never heard of and do your thing, it's therapeutic!
Remember to be careful when it comes to online tutorials and not just take my or any other rando's word for it! I'm not an expert; ideally you'd be learning things like fundamentals from professionals. Marco Bucci and Proko are two of my favorites who provide their super valuable knowledge for free on YT in really digestible ways; they've helped me a lot throughout the years.
And, most of all, remember that there's really no wrong way to draw as long as you're having fun. If you're getting something out of the experience, then you're doing it right!
Happy arting, everybody! ^^
