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Real ML and not just plug and play models takes a serious amount of knowledge

On the other hand, unless ML is your core competency as a business, plug and play models can get you really far.

When you consider the chain from inputs to action you can go far with a small toolbox (e.g. logistic regresssion.)

Plug-and-Play models in visual recognition basically work at this point in time; in NLP they don't.