Because of tech difference and superiority, monero became major altcoin.
Your Supervise about dash make strain dash-dev-team.
There's a very different set of priorities involved in constructing a base monetary asset from building an encrypted messaging or encrypted record keeping system.
In one, you are trying to be as transparent and authentic as possible, in the other you're trying to do the exact opposite - make something inaccessible. You can't do both at once (since those priorities are clearly conflicted).
What Dash is doing is implementing a cash paradigm, where each token is as indistinguishable from the other to support a level of plausible deniability at least equivalent to conventional cash. "Privacy" comes into it because:
A. cash does not require a 3rd party to facilitate the transaction (any cryptocurrency basically supports this requirement)
B. the money supply is symmetric (does not appear differently to holders and non-holders) and fungible so that it cannot be traced
The cash metaphor on which Dash is based uses discrete mixing of REAL money - not 1 real and 5 fake - just as the real world cash supply does at fixed points in its circulation - cash drawers in stores, consolidation reserves in banks etc. There is no magic to it because it's an inherent characteristic that's been with us for thousands of years.
This is difficult to do because it requires all kinds of non-technological, network-effect type support as well as the need to decouple the "privacy/fungibility" priorities from the "transparency" ones (so that transparency & symmetry of the coin supply are not eroded in the process). For example, the masternode network alone has taken 2 years to grow. If it was purely a technological challenge it wouldn't be worth very much because the tools would be easily reproduced and you'd basically just have a tech stock on your hands.
On the other hand, if you're just trying to "hide stuff" - the technology to do that is ten a penny. It's been around for donkey's years, is as copyable as pythagoras's theorem and doesn't add any monetary value to the token anyway. Gold would not be more valuable if it was diluted with lead to make it look less like gold. Diamonds would not be more valuable if they were cloudy and flawed. If people want to keep their messages and information private on the world wide web, they use something called SSH to keep it from prying eyes. But that doesn't make the SSH-tech suddenly more valuable than the http, ftp and Mail content that it may carry.
Thats why Dash is not needing to use Ring Signatures right now - the goal is fungibility (of the balances - not the frigging transaction ID's ! ), not invisibility.
Obviously over time you need to try to root out every distinctive characteristic and "fingerprint" on the token, including IP addresses ideally, and that process will be ongoing. But it won't be at the expense of ditching core monetary properties IMO.