Earlier quoted context omitted.
Over the last 20 years or so I've tried: index cards, wunderlist, todo.txt, remember the milk, Asana, Any.do, Evernote, Google Notebook, Simplenote, Trello, Workflowy, Google Keep, Bear Notes, org-mode, and probably a dozen others. Three years ago I started using Apple Notes and told my wife "if you see me trying anything else at all, yell at me". I've been pretty happy with it and am much more productive just using…
Is there an easy way to link other notes in Apple Notes? I've used Obsidian for years now. Mainly because it's frictionless, I can easily link notes, and just Markdown files. I don't spend time looking for cool new plugins or new methodologies, so I don't have those temptations. I wish there were a better mobile app, though.
However, I don't really recommend this as now you have a bunch of icloud links littering your notes and can become confused easily trying to determine which notes are actually shared and which ones were just shared with yourself.
It's one of the biggest weaknesses of Apple Notes, and the only reason I (tried) searching for alternatives.