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You are basically right with your observations. They are somewhat offset by the fact that using tf makes many tasks very easy/convenient that otherwise would take a lot of time to implement. Given that current computers are really fast, the advantages often outweigh the (in many cases largely negligible) performance impact of using tf.

That being said, it certainly helps to be aware of how tf works behind the scenes. For instance, designing some sort of system that launches hundreds of nodes subscribing to tf likely wouldn´t end well.