There is no absolute transaction privacy with any transactions, even with monero.
I am sure that for Bitcoin we are going to use some interesting second layer solution that will help as achieve much higher level of privacy.
Statechains is one of this options I like very much.
And yet there is a desperate and growing need for it as international forces grow stronger in their global reach, and more malevolent in their long-term goals.
Yes, no technical solution is perfect, but the right to private transactions should be legally enshrined so that even if technology falls short in some way, an authority of the people and by the people steps in and protects money rights as an unalienable right, like freedom of speech.