A recent blog post highlights a common but harmful practice in .NET logging: using string interpolation like Log(

quot;...") instead of structured message templates. While it looks convenient, this approach destroys the structured data that makes logs searchable and analyzable. When you use interpolation, the log message becomes a plain string, losing the ability to query by parameters, filter by values, or correlate events effectively. The post emphasizes that structured logging is critical for debugging, performance monitoring, and incident response. By using message templates with named placeholders, developers can preserve the structure and enable powerful log analysis tools. This is especially important in distributed systems where logs are aggregated and queried at scale. Adopting structured logging from the start saves significant time and effort in production troubleshooting.