The thing is that you're only looking at the blockchain symbolically. As if it were a record of your own personal finances which you expect to be viewable only by you. There are two problems with this type of simplistic appraisal.
First, this notion of "privacy" doesn't exist. In the credit money system all your transactions are open to all and sundry who work in the banking system. Thats because they are the entity responsible for endorsing their value. Equally they're visible to a whole bunch of people *outside* the banking system. For example I've spent many years building eCommerce systems and they all say "Submit your payment securely here" on the "Send" button in the checkout basket. But I happen to know that at the other end there are about 200 people who can easily access all the details submitted and in fact some of them *have* to access it to process it. The "secure" bit only applies to the wire that connects the customer to the vendor, but the question of whether it's a hacker or a rogue employee that steals the funds is kind of moot.
In crypto, the "backers" are the general public - in particular, the section of the population who do NOT posses private keys or hold any bitcoin (because that's who you're asking to form the other side of the trade you're executing and who you're expecting to endorse your holdings).
There's consequently quite a big step to cover before you even get to worrying about privacy - and that's value. In that regard, nobody cares about your privacy - it isn't their problem or the blockchain's problem to protect your privacy, it's yours and there are plenty of ways to accomplish it without taking a sledgehammer to the very properties that made your funds spendable in the first place.
Do you remember the "malleability" crisis that bitcoin had back in 2014 right on the back of the Gox fiasco with uncertainty about double-spends and all sorts of b.s. ? Do you seriously think it would have survived that if every address on the blockchain and every last transaction hadn't been completely and utterly transparent ? It would have easily sunk beneath the waves. The room for speculative torpedoing of confidence would have been massive given the press were in bloodhound mode anyway at that time and I'm sure such a fate awaits all obscured blockchains at some point. It's an attack vector that's as huge as it is inviting - especially from "social media engineering" sources.
For those reasons, Dash has one of the strongest privacy models of any coin as it stands. You've got a massive level of anonymity with no loss of transparency. Despite that, in a mature crypto economy we won't be using blockchain transactions anyway so the whole debate is kind of moot. How many of your exchange trades show up on the blockchain for example ? None.