I started programming professionally around the same time but I'm surprised that you think Promise.all([]) makes things easy. IMO Promise.all([]) is nice until you start supporting proper error handling.
I work a lot with databases, so say you're trying to write an object and its children in some sort of one-to-many relationship to the DB.
You can write a Promise chain like
startTransaction()
.then(() => writeParent())
.then((children) =>
Promise.all(children.map((child) =>
writeChild(child)
))
)
.then(
// handle success
endTransaction(),
// handle error
cancelTransaction()
)