Inflation bugs have nothing to do with privacy or scalability, but yes that will always be a problem with crypto in general. Although easier to detect Bitcoin is not inflation-bug proof as you know and once one is taken advantage of there is no good fix. You have to either leave the fake coins and devalue the entire network or hardfork them out and screw over users who gave away real goods and services for those fake coins.
afaik Dandelion++ fixed some of those original DoS issues