I only agree about 20% with this assessment of Datomic.<p>Their &quot;Pro Starter&quot; tier is free. It is plenty to get started with for many use cases.<p>It doesn&#x27;t take _that_ long to get up to speed with how it works and how to use it, and if it fits your problem naturally then it can save you so much time and headache.<p>That being said, I can understand people hesitating to use it.