In many cases, yes. Developers often choose Visual Studio 2015 specifically to avoid compiler, framework, or dependency changes introduced in newer versions that can cause build errors or unexpected behavior.
Yes. If you must reproduce the same binaries or behavior as an original build, using the same IDE version is often necessary. This is common in regulated industries, audits, and long-term enterprise projects.
Yes. With a valid Professional license, Visual Studio 2015 can be used for commercial development, maintenance contracts, and client projects.
Yes. This is one of the main reasons developers still use it. Visual Studio 2015 works well with legacy .NET Framework versions that newer IDEs may no longer fully support.
Yes. Visual Studio 2015 is widely used for large enterprise solutions and long-running projects where stability is more important than new features.