[Const-me]

> over trying to appease the kinds of customer needs that involve keeping 25 year old binary only jars running

C# doesn’t break too many things while it evolves. Example: https://docs.microsoft.com/en-us/dotnet/api/system.collectio... That class was introduced in .NET 1.1 way before generic, still present in the most recent .NET Core 3.1.

They sometimes deprecate higher-level stuff, but very conservatively so. E.g. asp.net web forms (2002) is deprecated, while windows forms (also 2002) is still supported.

[pjmlp]

Try to run random .NET Framework Assemblies on .NET Core or .NET Native, this is what Java philosophy tries to avoid.

Forms designer is still broken on .NET 5, and it might not make it to the final release.

[fomine3]

This is a single breaking jump after 20 years. This migration is really needed and well considered.