Because your local computer is not where you will run your production. You absolutely are not required to develop on the cloud, but you should at least consider

Because your local computer is not where you will run your production. You absolutely are not required to develop on the cloud, but you should at least consider (and in fact this should be “must”) test you code in thr cloud before you enable the knot to ship it in production mode. I’d argue if cloud is convenient for you and cheap as hell, no reason not to try. However, it is not cheap because you would need to setup your own cloudfoundry or kubernetes in AWS and whatnot (or the cloud provider’s native container solution), which often means renting a machine. So that’s why most people don’t do development in the cloud. They test their “just committed to my feature git branch” latest version in the cloud by means of automatic (Jenkins etc) or by pushing to the cloud manually.