Unfortunately in many cases you are, both DIY and professional. As often as not, Youtube is a good place to find how not to do something as opposed to the right way to do it.
As a matter of fact, even in many pro settings this isn’t done. Look at some of the big chain tire shops, like BurningRock. They pay their mechanics a flat rate amount of .8 hours to do a brake job, including turning rotors. If I’m getting less than an hour’s pay to do your brakes, I’m not spending time doing all that other stuff.
There’s a local brake/exhaust/radiator chain that had a sign up, front brakes $39.99. I asked the manager about that, he said that was just for labor. Parts were extra. OK, that’s still too cheap. “Well, we always upsell a caliper clean and lube for $39, resurface rotors for $40, and a bleed for $12.” By the time they were done the “discount chain” price was more than my regular price, and we do all those things as normal course of a brake job.