Looks interesting until I got to this section:
https://github.com/mimblewimble/grin/blob/master/doc/intro.m...
> In the above example, you had to share your private key (the blinding factor) with Carol. In general, even though private keys should never be reused, this isn't generally very desirable. Practically, this isn't an issue because transactions include a change output.
Yes - it's a change output and a new private key but it's not a great way of doing things.
Also - what's with the name? MimbleWimble?
There are definitely issues, but no one has managed to solve them so far. A lot of competing cryptocurrencies claim to have solved the challenges that Bitcoin faces, but there hasn't been any fundamental innovation in this space since Bitcoin. Except for MimbleWimble[1], which has made advances in terms of both scalability and privacy. All other solutions out there just move further towards centralization, while in the process gaining scalability (which everyone already knows is trivially possible).
[1] https://github.com/mimblewimble/grin/blob/master/doc/intro.m...