My memory is fuzzy, but...

1. all data flow through the rails app (no pre-signed s3 upload or download links for direct uploading).

2. no support for CDNs (I think newer rails versions added support)

3. blobs and attachments were unnecessary abstractions.

3a. Querying was annoying (extra joins) and easy to add n+1 queries.

3b. In my app, images are moderated and it was unclear where to put the moderation metadata (on blobs? attachments? create a new table? why so many tables?) or `deleted_at` type columns.

4. GraphQL gem didn't support it: https://github.com/rmosolgo/graphql-ruby/issues/1777