In short, everyone has their own dreams, preferences, (perceived)needs, and workflows and they are usually unwilling to tweak their own approach and would rather have a tool that fits them. They may be right that their "needs" are truly needs instead of just preferences but either way, you end up with a swarm of nasty little variations that are meaningless for vast swathes of the space. That's why any list of "project management tools" has 100+ entries and is still incomplete.
~10 years back, I realized that most of the people who are open minded enough tweaked their own processes to flip to something like Trello (as I did a few years later). They're still unsatisfied - I wish Trello had intercard dependencies and per-checklist item due dates - but making due.
Happy to offer more info and advice, feel free to ping me.