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It's fascinating how some SPAs come about. Often consultancies who win some bid to implement X features. Since "good user experience" is hard to quantify/specify, it ends up being a horrible end result.
Zalaris is one such that I'm in complete awe of. Set up user flows that are expected to take 30 minutes to complete. Yet, don't keep track of that state/progress withing your own SPA. Click the wrong tab within that SPA, and state is reset.
It's, just fascinating.
I used to work in a consultancy that was run by a designer, and this was painfully true. I had one memory of working for a big American client on a SPA for primary mobile use, and the SPA we designed for them had several animated videos in the background, had overlays for every product, and for "speed" we loaded it all in at the start - for the dozen or so languages supported
In 2016, if someone were to tell you that visiting this product page on mobile would eat 80MB, you'd probably be fucking fuming once your data bill comes through. The designers and frontend engineers didn't seem to care, because "it loads fine on our devices", all hooked up to WiFi...