[twooster]

A bigger danger still would be:

  const userPromise = fetchUser(id)
  const itemPromise = fetchItem(itemId)
  // Do stuff, maybe even more async stuff
  const item = await itemPromise
  const user = await userPromise

Since those promises haven't been awaited until later in the code, they could throw and result in an unhandledRejection, which would be pretty bad. Promise.all is much safer since it instantly awaits both promises.