Added enhanced cryptography support and enabled TLS Alerts by default for improved network security.

This is the primary reason to target 4.7.

The .NET Framework 4.7 is a significant update to the .NET Framework, which is a software framework developed by Microsoft that provides a large library of pre-built functionality, security features, and a virtual execution environment for building a wide range of applications. Released on April 5, 2017, .NET Framework 4.7 is part of the .NET Framework's "full" release cycle, which aims to provide a comprehensive and stable platform for developers.

Some of the notable new APIs and features introduced in .NET Framework 4.7 include:

A vast collection of reusable APIs and types for common tasks such as file I/O, database connectivity, and drawing. Key Improvements in version 4.7