I created something similar at my work, which I call "Long Lamda", the idea is that what if a lambda could run more than 15 minutes? Then do everything in a Lambda. An advantage of our system as is you can also run everything locally and debug it. I didn't see that with the FLAME but maybe I missed it.
We use it for our media supply chain which processes a few hundred videos daily using various systems.
Most other teams drank the AWS Step Koolaid and have thousands of lambas deployed, with insane development friction and surprisingly higher costs. I just found out today that we spend 6k a month on "Step Transitions", really?!