Using amplify with Next.js and existing aws serverless SAM app

I have an existing serverless backend on aws SAM application that uses cogito, api gatway , lambda dynamo db For the web client, I thought nextjs might be a good choice. I am a bit confused about the potential usefulness of Amplify here. Amplify seems to be primarily focused on helping front end developers (who are not experienced with aws back end development) build applications without directly doing anything on the AWS side, as amplify lets them create AWS backend resources from the "client side"..

On the other hand, I feel more comfortable creating and managing AWs resources by hand (using SAM) and I am not interested in automatic generation of AWS resources. However, I feel parts of Amplify might still be useful to me. For example, I might use Amplify libraries to build the UI for authentication and to call the api gatway with ease. Here are my questions

1. Is Amplify still a good choice when you are only using existing AWS resources only, and you are not creating or managing aws resources using amplify (I am using SAM for that)

2. Amplify has gen1 and gen 2 docs. While gen 1 has sections titled " Using existing AWS resources" Get 2 doesn't seem to have any mention of using existing AWS resources .Does this mean Amplify gen 2 doesn't support using existing AWS resources?