Why functions over Docker or Elastic Beanstalk? There's more than one PaaS path. On vendor lock-in, I'm moving between clouds now. Serverless did not translate

Why functions over Docker or Elastic Beanstalk? There's more than one PaaS path. On vendor lock-in, I'm moving between clouds now. Serverless did not translate well at all. We would have saved a ton of time, and frankly had an easier operational experience, if we went with Docker from be beginning. "Ok Jill, next we need to determine how Azure Storage Account bucket calls differ from AWS S3. Oh, S3 doesn't have queues so we need to use SNS which changes the transaction model...Yeah, we've gotta handle different guarantees" Product at most places "doesn't have the time" for developers to abstract the serverless hooks. You have to change the interface that runs your app instead.of the interface your app provides.