That's one paradigm that operates directly on the DOM, but, a lot of modern-day development tools (e.g. redux) don't work like that, and their programming model is a lot more straightforward than "remove the selected property from all siblings", instead just having a selected boolean expression for each element.

The performance question becomes a bit more tricky too then, because instead of comparing direct DOM manipulation you're comparing 'rendering' as a more abstract concept.