'Webapp' is not a narrow enough use case. 'Chat app' would be more of the depth I am talking about and even there you can easily build a basic chat application

'Webapp' is not a narrow enough use case. 'Chat app' would be more of the depth I am talking about and even there you can easily build a basic chat application using server-side rendering and smidgins of javascript to add new messages to a <div>. Generally I would say that SPA are overkill.