User state is sometimes necessary, but frequently a crutch to avoid answering the real questions. Much of the time, this user-state is at the core of many performance and behavior issues as the user is burdened with unnecessary DOM reorganization. If the layout is dependent on more than just URL parameters and simple server state/cookies, then it begs the question: does this page really have a specific, well-defined purpose? If not, it's ripe for noisy UX, confused users and hard to untangle interface bugs. If so, you probably shouldn't be doing so much on-the-fly DOM configuration. You're not building an OS or window manager here.

Notably, none of this is incompatible with React/Vue where you need it.