Almost everyone making online transactions thinks that using bitcoins would be a good way to stay anonymous. But the truth is bitcoin transactions are not really anonymous at all. All transactions are recorded and can be seen publicly through the blockchain. When you use your bitcoin to pay for goods and services online, you will need to provide some private information in some cases. This means that your transactions can be traced by a third party to find information. In order to avoid this from happening, bitcoin mixers provide services where your bitcoins are mixed with others to make it harder to be traced back from the original owner.
Do you think that it is a must for everyone to use a bitcoin mixer? Why and for what purposes?
Actually bit mixer services are used by those persons who are totally want to be anonymous and make bulk transaction .
And there are few people who want remain always annonymous due to some other reasons ( don't want prefer to show anyone ) .
But overall I don't think that there will be any use of the tracking because here in the current time many numbers of the wallets are available whose wallet adresses kept changes every hours and every transaction .So there is not much use of bit mixer ( but still some people needed because of thier business security and privacy ) .