A lot of AWS’s offerings are hard to use. But s3 really isn’t. There’s also firebase storage and backblaze b2 in this space. And they’re all easy to use standalone.
I suppose that's what this is https://elements.heroku.com/addons/bucketeer, but using S3 is really easy. And honestly I wouldn't trust most heroku addons are maintained outside of the most popular - postgres, redis, memcache.
I’d rather not have to manage a side account for AWS, and set up the connections to it and things. I’d rather it was just there, like their database.