So there you have your answer(s). In years past, I think it was necessary to close apps just like I do on my Windows PC. I'm no longer convinced of that, but others are. It probably depends on the device, installed apps, and actual usage. I think your best bet is to test it for yourself, but very deliberately. In a given day, decide if it's gong to be a "close the apps" day or a "leave then running" day and see how it affects your performance and battery. Sorry it's not clear.
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