>What I'm having a heck of a time finding is technical content; long-form programming tutorials, deep dives into academic concepts

github search is good for that. search for 'list of awesome anytopic'/'curated list of anytopic'/'list of anytopic' and you might find a repository with a curated lists of links on anytopic. (search box on the main page of github)

You even have the 'The definitive list of lists (of lists)' https://github.com/jnv/lists

You might also want to check my side project: I have a search tool / catalog of duckduckgo !bang operators, i am hoping that it allows for better discoverability of specialized search engines.

https://mosermichael.github.io/duckduckbang/html/main.html - (best viewed on a PC)

here is the project page on github: https://github.com/mosermichael/duckduckbang