You don't have to. You can, however, if you want to.
I used this stack (S3, CF, R53, & ACM for SSL cert) to deploy a static site built using Hugo, which can deploy directly to an S3 bucket.
If you're crafting the site yourself without a builder, you can just use the AWS CLI to `cp` the files to the S3 bucket. You may need to invalidate the CF distribution if you want everything updated quickly worldwide.
