This story is fun, the constant buildup of enemies, then MC tearing them down is the vague plot.
Actually, pretty much every part of the cultivation system is vague. Especially MC's progress through his cultivation adventure.
Everything is tried once, especially techniques, attacks or w/e. MC really likes to put people down after they have used all of their trump cards.
In some ways, the author did a good job, but quite a few details were skimped. This is a novel about the feeling of 'dominating' opponents, which the author certainly gets right. What does a super-emperor care about lowers?