um yes and no. MimbleWimble and CoinJoin are certainly interesting improvements to the Bitcoin protocol. Strong words on Bitcoin. The DASH implementation is very sloppy with the masternodes.
For annon I would put my weight behind Monero. That is about it, still giving zk-SNARKs some time.
But the only issue with Coinjoin is the need for a tusted party to do the anonymization. I believe Joinmarket itself has fixed that, and it provides strong anonymity if used properly.
Exactly why I dont really care about those. I would rather use a protocol that is annon at the actual protocol layer.