but isn't the amount of transactions with mixing 0 important? maybe i missunderstood something there if there are a lot of transactions with mixing 0, this is bad for all of us no? or ist it such a problem becasue of the stealth adresses?
Stealth addresses are 100% not affected at all and certainly give a measure of privacy even if mixing is totally broken. Of course the privacy is far less than if mixing worked perfectly (otherwise why even bother with mixing!), but it does't fall to zero.
I tend to have more of a glass-half-full view on this which is to say that if you look at the recent stats (on moneroblocks.eu), the share of mix 0 transactions last year was 80%. Last month it was 67%. The number will surely continue to decline when 0.9 is released and people make the transition to having an enforced minimum in six months.