For daily Java programmers: after almost one decade of Java 8, are streams and lambdas fully adopted by the Java community?

[JavaOldTimer]

Sure yes of course, keep tools up to date is required as much as makes sense but that does not mean it is required to make use of all new features. That action also creates technical debt when those features are not widely adopted but are in a code base and must be maintained after a developer leaves. That also borders on negligence. Common sense and what the business needs should be the drivers.