Not to refute your claim, but this is my 3-line bash script in order to build and upload a static bundle:
"""
#!/usr/bin/env bash
rm -rf public
hugo --verbose
aws s3 sync ./public s3://$BUCKET_NAME --profile s3_personal
"""
You can set custom TTL for CloudFront to 0 for instant refresh in production. Dev server is `hugo server`, `hugo` is a single Go binary you can Dockerize with --net=host and --volume=$(pwd):/app to use your own dev environment. If you don't maintain too many large static assets, your cost is like 5 cents a month, and I think that's a competitive price, not AWS being generous. $12 / year for a custom domain via ICANN, and Route 53 manages A/AAAA/CNAME/MX records for free.
Again, not to refute your claim. I'm a single author, who publishes as a hobby, with a single dev and a single prod environment, so if things break down (it hasn't for years), it's easy to fix. It's much different than content marketing and enterprise use cases. Even so, I would rather start here and add a static CMS like Forestry before considering a custom solution like Netlify (which is probably built on top of AWS anyways).