While this is somewhat true, to each his own. It is a fact that if you NEVER close any apps from your switcher (say 100 apps) these apps still use ram to save them in some native backgrounding state whether its paused, backgrounded etc. Ideally ios should close an app at the end of your task switcher if your device uses all its available ram BUT this does NOT always happen and the result is crashing apps and a slower device. I have had to fix multiple non-tech savy friends devices by deleting everything in their switcher or hard resetting.
Bottom line...if you have an older device these tweaks are useful but not so much for newer devices other than the anal ppl who like control.
If Apple's ios native backgrounding was perfect then I wouldn't need to use a tweak like Backgrounder to give video apps the ability to continue playing in the background/still play the audio when I switch to my messages app to reply to a text...lol
Or I guess you need to use another non-ios tweak like bite-sms to do it from the video app itself. lol...either way Apple sux.