Analyze the following discussion about "Is DSA still necessary when modern programming languages provide built-in libraries?"
Compare all participants' viewpoints. Identify:
- Common arguments supporting DSA
- Arguments supporting built-in libraries
- Differences in opinions
- Real-world software engineering perspective
- Examples where DSA knowledge is required despite libraries
- Examples where libraries are the better choice
- Final balanced conclusion
Create a professional developer-level answer explaining why DSA and libraries are complementary, not replacements for each other.
Focus on scalability, performance optimization, debugging, system design, and engineering decision-making.