Our idea for simpler template code

existing.js

module.exports = async function (context, req) {
    context.log('JavaScript HTTP trigger function processed a request.');

    const name = (req.query.name || (req.body && req.body.name));
    const responseMessage = name
        ? "Hello, " + name + ". This HTTP triggered function executed successfully."
        : "This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response.";

    context.res = {
        // status: 200, /* Defaults to 200 */
        body: responseMessage
    };
}

proposed.js

module.exports = async function (context, req) {
  context.log('HTTP trigger function processed a request.');

  const name = req.query.name || (req.body && req.body.name);
  let message;

  if (name) {
    message = `Hello ${name}`;
  } else {
    message = `Pass a name in the query string or body to say hello.`;
  }

  context.res = {
    body: message,
  };
};

For readability we are Intentionally avoiding optional chaining, ternary, and object value property shorthand

We also updated the text to be more conversational.