As you say it's very context dependent. Trello makes sense as an SPA because the user stares at the same page all day (the board view), for long stretches at a

As you say it's very context dependent. Trello makes sense as an SPA because the user stares at the same page all day (the board view), for long stretches at a time, and often requires interaction like dragging cards around. For Google Maps the user spends some time finding the right location, and does a lot of panning. The HR solution my company uses… there the user goes to very distinct pages (time off, goal setting, etc.) and interacts with it by filling in forms. That probably shouldn't be an SPA (but is). It's considered a bad move to use SPAs because product managers tend to err on writing an app when they should be writing a site; the reverse rarely happens these days.