List entity_usage as alternative

Thanks for raising this @anybody! I wasn't aware of that module.

Best would be to document the differences?

Agreed - that would be the first step to deciding next steps.

Would you like to undertake this? :-)

Maybe even both modules should get merged?

I'm open to this! I will say, one thing I like about entity_reference_integrity is that it is small and focused on only one thing: entity reference constraints to prevent deletion.

I haven't tried entity_usage, and it does claim to provide that feature, as well as other things. My inclination is generally towards smaller focused modules, because they are easier to maintain and keep up with Drupal core major version upgrades over the long term. So that is the perspective I might bring to the conversation. But let's do a full comparison to start!