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 (add-ons) to help people with their privacy?
Bitcoin's primary principle is to facilitate peer to peer transaction, and the priority is not privacy. This can be seen in the whitepaper where the mention of privacy is a small section without going through it in depth. That aside, I don't believe Satoshi should have attempted to improve the privacy of Bitcoin, like Monero or other similar cryptos. Reason being, I don't think he could've done it efficiently and implementing it in the protocol as a feature would have tons of repercussion should the features not work as expected.
Bitcoin has a convenient feature of being pseudonymous, and that is how privacy is enhanced from the on-start. I don't think Bitcoin requires privacy enhancing tool, unless we are absolutely sure that it is infallible and bulletproof. The side effect of features like these would be having complacent users which over-relies on whatever Bitcoin can provide. I don't see a problem having it out of the protocol, having it included with the protocol could potentially introduce problems down the road.