Promise.all(resourcePromises).then(function(values)
    {
        console.log(values);
    });

Promise.all(promises.map(Promise.all)).then(function(values) {
    console.log(values);
});

function deepAll(array) {
    if (array instanceof Promise)
        // Just in case...
        return array;
    else if (array.length == 0)
        // The 'real' function will fail with an empty array and it's the same in both cases anyhow.
        return [];
    else if (Array.isArray(array[0]))
        // There's another array level, so turn it into an array of promises.
        return array.map(deepAll);
    else
        // This is an array of promises, and we already have a function for that case.
        return Promise.all(array);
}

deepAll(promises).then(function(values) {
    console.log(values);
});

function *deepWalk(arr) {
   for (var item of arr) {
     if (Array.isArray(item))
       yield* deepWalk(item)
     else
       yield item;
   }
 }

 Promise.all(deepWalk(resourcePromises)).then(...

const balancePromises = [...];
const symbolPromises = [...];

const [balances, symbols] = await Promise.all([
    Promise.all(balancePromises),
    Promise.all(symbolPromises)
]);