In addition to CSV imports, it would be invaluable to have a user-friendly import wizard (with step by step prompts) to allow you to easily migrate your data into SmartSuite.
This might include wizards for platforms like: Airtable, ClickUp, Asana, Notion, etc...
For an example of this, see the "Import from Popular Apps" section on ClickUp's documentation (https://help.clickup.com/hc/en-us/articles/6311099045783-Importing-Into-ClickUp).