If you’re not using Amplify for your front end then NO.
If you are using Amplify for your front end and you’re currently using Serverless/SAM for your backend then I would continue doing that but keep an eye on Amplify CLI.
If you’re starting a new project and you understand AWS serverless plus the Serverless .Framework/SAM then I would probably continue using Serverless/SAM. Again, keep an eye on Amplify CLI.
If you’re a front end developer starting a new project from scratch who wants to use AWS serverless and Amplify but doesn’t understand much about the backend services then use Amplify CLI.