Sharp verdict
Do not launch Lovable as a broader version of GPT Engineer. Launch it as the fastest credible route from an idea to a working first product for non-technical founders.
Lovable already has attention and technical legitimacy. Its constraint is whether a new user can reach a complete, useful result reliably enough to believe the larger promise. Concentrate demand around one job, make that job immediately experiential and withhold expansion claims until activation and retention prove them.