denial. they barely try a given method for all of a day and because it doesnt work, the method must be busted as its surely not them. and its definitely not the fact that they draw once a month and then go back to fapping and shitposting.
even in an anonymous setting like this, you will never see anyone whos actually good being so vindictive on a method unless its something silly like a tumblr-ish tutorial that teaches bad habits (IE shade everything with purple on multiply). even methods that may not work for some have merit. hell i never liked loomis for drawing heads (steve huston can redpill you on why the ball is bad) but to say its a complete waste is a huge stretch. loomis can draw so following him is better than following nothing or following pure intuition.
to delve deeper on why "feel the form" escapes beg artists, its likely because they are trying to feel the form on complex objects they cant understand. they dont start with ovoids or beans a la dynamic sketching, they try and tackle something as deep as an entire figure immediately and wonder why its so hard to master gesture, flow, perspective, line, form, anatomy, etc etc all in one go in their first year of drawing. and they are weak willed, so instead of pushing through it or finding another way they relinquish efforts and pretend that they are above those who actually know what they are doing.