I completely agree with you on many things.
That's why I think, from the very first minute, that the code needs to be further developed.
There's a lot to improve on.
I think the 50,000 premine coins obviously belong to the developer, I think we can leave that to him out of respect.
The developer thought of a lot of things, but that's in the past, he didn't have the chance to work it out.
The block reward will almost certainly have to be worked on.
I hope I understand what I'm describing.
Now, in about 1440 blocks a day, 3,240,000 coins are generated.
However, the total supply is only 2.5 billion.
In other words, all coins will be mined in a maximum of 771 days.
At that time, I didn't even count the premine and the higher rewards of the first period.
In other words, about another year and a half and the block rewards will be over.
Here, it's important to build in a steady or decreasing reward, which will increase the supply, but nicely and evenly.
I think the block reward itself is sufficient, I would reduce it periodically or slowly.
I don't quite understand what you mean by the zerocoin, legacy and Zpiv parts of the code.
I don't have enough knowledge to understand how you want to change it.
Could you elaborate on this a bit?