The biggest privacy issue with grin is it doesn't hide the transaction graph. See their own write up[0] which offers a very good and nuanced privacy discussion. This means, for example, you can be tracked by colluding vendors. Or can be identified when trying to accept payments anonymously.
I don't think blinding factors are as much of an issue.
Zcash setup doesn't matter for privacy. The larger issue is as you said, adoption of private transactions.
I don't think blinding factors are as much of an issue.
Zcash setup doesn't matter for privacy. The larger issue is as you said, adoption of private transactions.
[0]https://github.com/mimblewimble/docs/wiki/Grin-Privacy-Prime...