Gavin from Zebrium here. Completely concur with #1. We are big advocates of writing good logs and not having to worry about structured vs unstructured (and even if you structure your logs, you'll still probably have to deal with unstructured logs in third party components).

Our approach to deal with logs is to use ML to structure them after the fact (and we can deal with changing log structures). You can read about it in a couple of our blogs like: https://www.zebrium.com/blog/using-ml-to-auto-learn-changing... and https://www.zebrium.com/blog/please-dont-make-me-structure-l....