One complaint is developers defaulting to using SPAs for building traditional websites which aren't apps, recreating the functionality that modern browsers are

One complaint is developers defaulting to using SPAs for building traditional websites which aren't apps, recreating the functionality that modern browsers are already good at, and there's plenty of good backend frameworks that have been around for while, where content can be loaded quickly, so a full page load isn't a big deal as long as it doesn't have a bunch of JS it has to wait on.