Frankly, the usefulness of multi-page templates *is* quite limited. You should avoid using them for any more than a handful of pages. I would say, even not more than 2-3 pages. Otherwise, you will suffer from extended load times and possibly bumping up against limited memory on some mobile devices.
The problem is, few sites fit in a handful of pages. Or, at least, few sites that fit in a handful of pages remain a handful of pages.
Once you've built a site as multi-page, it can be a big job to switch it over to single-page. Yet, almost every site built as multi-page eventually needs to be switched to single-page. So, why not start now?
There really is no compelling case for multi-page. You can control caching when using single-page documents using data-dom-cache and data-prefetch.
If you really insist, this is one of the few cases where the use of data-ajax="false" makes sense. When the user logs in with an different ID, you should reload the main URL with data-ajax-"false" and it will reload the entire document.
But please consider switching to single-page, while it is still practical to do.