Welcome to sales tactics ;)
Datomic is great but as another commenter said, is good for "small-ish backoffice systems that never has to be web scale". You almost probably can rely on querying history for internal applications. I think their primary market was for companies to use it internally but they never made this clear.
> "small-ish backoffice systems that never has to be web scale".
Doesn't production use of Datomic by Nubank and Netflix (to mention just two examples) belie this assertion?
Do those companies specify what they use it for? They probably have their own internal "small-ish backoffice systems".
Nubank is one thing, but for Netflix, just like for any big company 10000 DB technologies are probably in use at the same time.
And 9996 of them are used for stuff like the internal HR DB or other minor projects.
Alternatively, Datomic wasn't performing up to snuff, and they found it cheaper to buy Cognitect than do a DB migration :D
The first feature on benefits (and the only reason I've ever heard Datomic brought up and/or considered it myself for production workflows) is using that stuff in application workflows: https://docs.datomic.com/pro/time/filters.html#history
Could be you're saying it in fact doesn't work well performance-wise, that'd (surprise me but) certainly explain why it's not more popular -- but I think it's clear it wants you to use this as an application feature.