IOS Multitasking -- Do I understand it correctly?

Due to many problem about battery drain and some request for kill all Apps with 1 button, I would like to share my understanding about the multitasking issue which many people think of it as the cause of problem.
AFAIK, There is NOT real multitasking in iOS for other Apps except the system apps. And system apps are not take CPU time that much to make the A4 processor to burn CPU that hot and drain battery that quick. The only effect of running (or other word, opening) too many Apps is that it will consume memory to much and it will cause a noticeable lag time when switching between Apps.
In my case, rebooting the phone, once or twice, with closing all apps before, helps NOTHING.
So, regarding the issue of battery drain and (little) slow response, please everyone do not blame yourselves for opening so many apps at the same time. It must be the OS itself that have something wrong about managing the process that take too much CPU time. I assume that there must be some system process trying to do something but cannot do it then sleep and wake up in a short interval to try again and again. The process could be about Push Notifications involving the metadata of some apps that inconsistent with the updated OS as they said.
So I would like to conclude that opening too many app is not the cause of battery drain, and kill-all button help nothing in the case.
Just want to share.

AFAIK, There is NOT real multitasking in iOS for other Apps except the system apps.
Yes there is, but there is no need, reason, or benefit for the overwhelming majority of 3rd party apps to run in the background when leaving the app. The number of 3rd party apps that run in the background are few and far between since there is no benefit or reason for the apps to do so. Music streaming apps run in the background, and a number of GPS navigation apps can run in the background. Most other 3rd party apps will be suspended or quit when leaving the app.

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