One of my employeers had a multiple megabytes SPA with a shitload of dependencies (Angular) in production that was just a glorified upload form. All the heavy lifting and verification was done by the backend anyways and it was a pain to upgrade, especially with angular major updates etc.

Since we replaced it with a vanilla HTML upload form and some templating to display feedback from the backend no more maintenance was necessary and the users and testers where still happy.