I don’t think anybody is saying that you shouldn’t force-quit bad apps that continue to burn resources when they’re supposed to be idle in the background. And Facebook is one of the worst offenders.
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There’s no harm in doing this, apart from the wasted time you spend doing it, but there’s no benefit either, unless you want fewer items in the App Switcher. iOS ensures that those apps aren’t using any resources.
The Switcher is actually more than I’ve thought it to be in the past. It appears to be the repository for what we may have thought were ‘closed’ Safari windows and also to be the only place that you can completely close those windows.
To wit: On an iPad, open Safari, then a 2nd and then a 3rd Safari window. Depending on which side you choose to open the 3rd from, either the 1st or 2nd window will be replaced. Annoying? Well, it turns out that these windows are moved to the App Switcher and will sit there until you ‘slide up’ in the Switcher to close them. NB, this doesn’t ‘quit’ Safari. It only closes each window, one at a time.
I think Apple need to rethink this slightly, but for the time being, it’s not bad… just a little unintuitive that your ‘open’ Safari windows are not available from within Safari, but from the App Switcher, where they are mixed in amongst other apps.