Microsoft Edge will let you control how much RAM it uses soon

Microsoft is working on a new feature for its Edge browser that will let you limit the amount of RAM it uses. Leopeva64, who is one of the best at finding new Edge features, has spotted a new settings section in test builds of the browser that includes a slider so you can limit how much RAM Edge gets access to.
↫ Tom Warren at The Verge

Isn’t it the operating system’s job to manage memory? It seems very archaic to manually set memory limits on an application, or am I totally out of touch?