[wildfire]

Not true.

Terraform v0.9 only handles remote state and locking properly. Handling multiple applies of state is something scheduled for 0.10

Basically terragrunt handles some stuff today in a less robust, less portable, way that your team is likely to need today -- whilst waiting for core terraform support.

(disclaimer: I follow terragrunt and terraform very closely but do not actually use terragrunt in producution anymore).