- GQL: the only case where I'd use GQL is where he would likely want to too: building native mobile apps. Otherwise, I'd use tRPC and have fullstack type safety. This is included in my 5 minute estimate because I'd use create t3 app, which has this configured out of the box https://trpc.io/ https://github.com/t3-oss/create-t3-app
- monitoring/observability: not quite sure what you mean, but it's only a few clicks in vercel to have a logdrain or metric drain and configure alerts and dashboards in your tool of choice. And if I wanted to roll the whole thing myself... that's what he did. Rolled it all custom by hand. The difference is I have the option of not reinventing the wheel.
At the end of the day I can get into composing a docker image that is configured just like his prod servers if I need that access, and there's likely already a docker image pre-done that has 99% of what I need, including metrics/monitoring. At which point I could launch my service on any number of hosts that allow direct pushing of built docker images, if my build process goes there.
To each their own, but I think my solution requires far less time to setup and maintain, but costs more, as I said. Manually engineering each system yourself might be fun to you, but it's not to me.
