I use java streams all the time. But it's very much "programming in the small" which doesn't matter much in the grand scheme of things if you use for loop.
You still have not understood; Map/Filter/Reduce is a structural pattern. It is based on what one would call "Dataflow Programming" (https://en.wikipedia.org/wiki/Dataflow_programming). A good example is the use of Unix utilities using the pipe operator where any utility in the chain can be of arbitrary complexity.
