My friend, you seem genuine in your enthusiasm if a little misinformed, so in the spirit of trying to stoke that rather than smother it, can I gently alert you to the thousands of bug bounty write ups you can read online? A decent place to start is the various H1 Disclosed writeups [0] but there's an avalanche of this sort of content on Medium (most not as well written as OP's, it must be said, but still very technical and detailed.) Good news! The time you're nostalgic for is right now! If people would like to share other blogs below which also post technical writeups for this poster, feel free. I'll throw in another one [1] too.
Thank you, this was precisely what I was looking for, as searching for "bug bounty write ups" in the past was more noise than signal; but this is what I wanted, thank you a lot!
[0] https://twitter.com/h1disclosed
[1] https://jub0bs.com/posts/