Yes.
We recommend Document Intelligence Studio most of the time because it can reduce your time for configuring Document Intelligence resources and storage services.
Only consider using the Form Testing Tool (FOTT) for the following scenarios:
Your data must remain within a single machine. Use the FOTT Sample Labeling tool and a Document Intelligence container.
Your project is highly dependent on Document Intelligence V2.1 and you want to keep using the v2.1 APIs.