I'm struggling with this (SPA vs no SPA), and think you are stating the obvious:

overall experience the end customer is going to need and expect.

data analysis, frequent order entry, or highly dynamic UX

The hard part is, how do you measure that? obviously some web apps need highly dynamic UX, a spreadsheet, some not, a blog, choosing between these two is easy.

But most web apps sit somewhere in the middle, I don't know the answer, but for example, how much will github users benefit from the experience of a SPA?