IMO MPA apps that don't break the back page and support multiple tabs and windows are far easier to have the side by side comparison model than SPAs which get fun dom nonsense the moment you try and do something the dev didn't precisely expect.
But the folks using the company's line-of-business apps mostly aren't even aware that the browser can open a particular part of the app in a new tab, and even when they are, they aren't aware that the tabs can be torn off into separate windows, and of those that do, there are still some who wouldn't figure out that both browser windows can be tiled side-by-side.
And even when you pass all those hurdles, it's still disruptive enough to the normal workflow that most people who can do that won't do it at all anyway.
