XSLT 3.0 introduces several new features and improvements that can enhance the development process, increase efficiency, and provide better results.

1. Performance Improvements: XSLT 3.0 includes optimizations that can significantly improve the performance of transformations. This can lead to faster processing times for your stylesheets, especially for complex transformations or large datasets.

2. Higher Productivity: XSLT 3.0 introduces many new functions, operators, and features that simplify the transformation process and reduce the need for complex workarounds. This can lead to more concise and readable code, which in turn enhances developer productivity.

3. Support for JSON: One of the major enhancements in XSLT 3.0 is its ability to work with JSON data. This is particularly useful in modern web applications where JSON is a common data interchange format. XSLT 3.0 allows you to transform JSON data to other formats, making it easier to integrate with various systems.

4. Improved Error Handling: XSLT 3.0 provides better error handling mechanisms, including the ability to catch and handle errors in a more fine-grained manner. This makes it easier to debug and troubleshoot your transformations.

5. Enhanced Grouping and Aggregation: XSLT 3.0 introduces the xsl:for-each-group instruction, which makes it easier to perform advanced grouping and aggregation operations on your input data. This can simplify the transformation process when dealing with complex data structures.

6. Support for Streaming: XSLT 3.0 supports streaming transformations, allowing you to process large documents or datasets that may not fit entirely in memory. This can be a significant advantage when working with big data scenarios.

7. Built-in Templates: XSLT 3.0 includes the concept of built-in templates, which can help reduce redundancy in your stylesheets. This allows you to define default behavior for certain elements without having to explicitly specify templates for them.

8. Improved Regular Expression Support: XSLT 3.0 provides enhanced support for regular expressions, allowing for more powerful and flexible pattern matching and manipulation.

9. Dynamic Function Calls: XSLT 3.0 enables dynamic function calls, which means you can construct function names or expressions at runtime. This can be useful for creating more flexible and adaptable stylesheets.

10. Backward Compatibility: While XSLT 3.0 introduces many new features, it also provides backward compatibility with XSLT 1.0 stylesheets. This means you can incrementally upgrade your stylesheets and take advantage of new features as needed.