I believe the reason why Satoshi didn't make bitcoin a total anonymous is because he wants bitcoin to be used in a diverse way and that's the reading why we have to conjoin supported wallets and bitcoin tumbler site for the purpose of those that want to make anonymous payments.
One thing I often hear is how bitcoin should become a fully anonymous cryptocurrency. No, it shouldn't. If people want bitcoin to truly become mainstream then making bitcoin fully anonymous would destroy that goal. I believe in these types of currencies, such as with Monero whom I support fully.
I guess some people never understand that one of the reasons the institutions and governments were unable to stop bitcoin while some law firms supported it is because of benefit and it is not anonymous or else we won't have seen any of them legalizing bitcoin.