Bitcoin provided sufficient privacy while keeping it simple and easy to understand. If used correctly with the appropriate tools (mixers, coinjoins, etc), then it would provide very good privacy where adversary would have a hard time trying to prove any plausible link.
The issue with privacy doesn't actually lie within Bitcoin, but it is mainly about the user's behaviors. Most privacy leakage are caused by the user's privacy habits that doesn't lie with Bitcoin.
Well obviously privacy leakage mostly happens due to human error. The tools you have mentioned are great, but they aren't built-in in Bitcoin. They were developed to provide higher privacy and of course, they are welcome. But my point is, Satoshi himself mentioned that "bitcoin should be used using Tor". So, doesn't Bitcoin "kind of" need these tools to help people with their privacy?