Privacy coins are mostly well built out of the box for those who want to make transactions anonymously, something that's not available in Bitcoin mech, but I understand why people wished that Bitcoin was made this way, more people will always prefer Bitcoin over XMR, but the truth is XMR is perfect for anonymous way of moving funds around.

I am glad that Satoshi doesn't build Bitcoin as a privacy coin because the hate will be much more than what we are seeing today, the government will even have more reason to want to kill Bitcoin, it will be called the criminal's digital money and it will fits just well.

Mixers are not really necessary, I haven't use it once because I don't see why I should, and if I have to do any private transaction I will go for Monero (XMR).