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MixPanel is nice, but its support for multiple sources of data is not very good. You can slice and dice events, but if you want to join that to your user database, things get awkward/not-possible pretty quickly.

The 2nd thing is that MixPanel is write-once, read-forever. aka if you misspell something or change definitions you end up in a bad place. These ETL processes are much more capable of adapting and normalizing a schema over time.

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