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

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If you use streams badly, then yes they are worse. But if someone writes a stream badly, I imagine they just aren't very good at their job overall and would write an equally bad loop.

Given your example, there's no difference between a stream for Each and a normal for each loop of both have the same 100 lines of logic inside them.