it's a combination of a number of things.
1) milos never takes his theories to skinny newbies, they're always applied to IFBB pros or top-level NPC guys who have already built all the muscle they need but now they're looking to "refine", whatever that means. it's incredibly rare that you'll find someone who built themselves up with those methods.
2) progress is impossible to gauge with complex routines based on non-markers like "burn" and "pump". how do you quantify your workout when you have no goals for resistance? if you did your sets easier this week, is it because you accidentally rested a few extra moments or because you got stronger? which of your five exercises in the set do you add weight to?
3) people overcomplicate things in general when the simple formula of "body adapts to task, make task more difficult" is plenty for the vast majority of trainers.
imagine for a moment you want to get good at basketball. specifically you want to improve your three pointer. you could get a ball, hop on the three point line and work on your accuracy. or you could watch a special on the NBA players and adopt their loony methods with tennis balls, tires, and whatever else they use.
only you're not an NBA player. you aren't so advanced that you need to start trying unorthodox methods in order to make those incremental improvements once traditional "grab ball, improve aim" practicing has topped out for you. until you are at that level, not only don't you need to use the elite NBA methods but they'll likely do you no good anyway. this is why many elite WSB trainers shift their exercises every other week but louie says that newer guys shouldn't rotate nearly as frequently.
you starting to get it?