The ecosystem is certainly more mature than many smaller languages, but it is still in a different league than Java’s. Most of it is not too great copies of the corresponding Java library, often being made by Microsoft only, with plenty of paid options while in the java world all of it is open-source and free, while offering a much wider selection.
Also, you will find a java library for that random new tech you want to use, while it is likely missing for .NET.
Also, you will find a java library for that random new tech you want to use, while it is likely missing for .NET.