I really don't think that feature will be added to stock Android.Though I would like, I don't expect to see this in the next OTA
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I really don't think that this feature needs to be added to stock Android. If you have trouble with an app, then swipe it away in the recent apps list. Otherwise, there is simply no reason to close all.
While they apparently don't take up any resources sitting open, it would be nice to have a close all function just to help get rid of the clutter so you can of all that apps you have sitting there open. Sometimes it's just nice to start fresh in that list.
It's quite simple to turn off chrome tabs in the recent apps - it's a setting in the chrome browser settings.
The purpose of recent apps is to allow quick switching to an app that you recently used, so you can quickly switch (for example) from a browser tab to Google search and then quickly back to the browser tab again without having to go home and find the relevant app. The purpose of the recent apps is not to close them but to switch between them.