How complex ARE your models in Industry, really? (Imposter Syndrome)

Perhaps some imposter syndrome, or perhaps not...**basically--how complex ARE your models, realistically, for industry purposes?**

"Industry Purposes" in the sense of answering business questions, such as:

* Build me a model that can predict whether a free user is going to convert to a paid user. (Prediction)
* Here's data from our experiment on Button A vs. Button B, which Button should we use? (Inference)
* Based on our data from clicks on our website, should we market towards Demographic …

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