If you are coming from a IaC background (ex, Cloudformation), I would say Render.com’s blueprint is really early stage. It’s not very well designed and has a lot of flaws that make it hard to fit in with existing engineering methodologies. It’s only tolerable right now because my project is in the prototype stages. However, I wouldn’t recommend it for bigger teams.
Edit:
Here is a thread that I wrote previously in regards to Blueprint that might give you more insight into the issues with Blueprint: How was blueprint designed to be used?