Inherited a site where someone had disavowed a huge chunk of the backlink profile, including good, legitimate links. A cleanup that went way too wide.
Disavow is a chainsaw, not a scalpel. Tell Google to ignore a strong, relevant link and you've thrown away ranking signal you earned. Rolling it back is slow, and recovery isn't guaranteed.
Before you disavow anything, be sure it's actually toxic. Most links people panic about are fine.