There is nothing special or difficult about this functionality, other software could do the same thing, easily. :)
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Is there somewhere I could point others to so they could learn from your work? EDIT: Not sure if I'm misunderstanding the notifications, if I keep it on do I get notifications about replies to only my comment or any replies to the thread (which is what I want, like forums did\do)
https://join.piefed.social is the general project hub for PieFed, it has some background and techy blog posts.
Currently the notifications are just replies to only your comment. A more flexible and wide-ranging subscribe-to-anything notification system is a high priority: https://codeberg.org/rimu/pyfedi/issues/20
Awesome, thanks!