Hi....We are trying to move from Prefect 1 to Prefect 2. In all our flows, for all tasks, we inherit where we inherit from Prefect Task class. I understand that we cannot continue this in Prefect 2. Is this correct or there is any alternative? Asking this because it would be a big change for us to change all the flows and tasks to use decorators instead.

Yes, adding the decorator is the best option as the programming experience is closer to pure python with merely adding this decorator to your pre-existing python functions. Of course you can programmatically create the flows and deployments, but its more of a hand on approach for orchestration.