first off prove it post a game winning against Stockfish9... secondly there is certain ideas that the computer gives you on how to play when your opponent plays some moves that comes up alot so you know how to deal with it.
Why do people use engines for analysis, sparring, and cheating?
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Engines are absolutely useless. any human on any given day given infinite time can beat an engine, engines have 0 intelligence nor do they understand the depth of the position. there is no benefit to using them, the only way to make progress is good old fashioned analysis, analyzing master games, and stripping chess into certain elements and working on them in isolation. like bodybuilding. you isolate the triceps, biceps, quads, etc. one muscle at a time, except with chess practice, learning from your own mistakes and other stuff. the benefit as a whole from engines is microscopic and it is ridiculous to imagine people actually going over their games with engines and losing their own thoughts, messing up their own algorithms based on a calculated variation that happens to work in a certain circumstance. it degrades human intuition. now if you were to analyze with alphazero on the other hand i can see where you are coming from. or using an engine as a "sanity check" like in math then fine. but using them for everything is nonsense.