Please don't use that one everywhere, frame-based embedding is very useful in e.g. web-based feed reader (provides the original view of the site without having to go out of the reader and into a new tab).
Unfortunately, as the web stands today, for our developers I do advocate including it by default, unless a specific use-case comes up to not include it.
While for a simple content page allowing for framing should be okay, the truth is very very few pages are actually purely content. As soon as you have something like a comment form there is a chance that framing it could be used to reveal some private information (autofill / password manager leakage).
And who is going to manage what pages are framable and what aren't? The customer would need a UI and training and developers can't always see what will be hosted on a page.
Also, as an advertiser I would very much like you to visit the full page instead of trying to view it through some limited frame, cutting off the sidebar with ads.
Please don't use that one everywhere, frame-based embedding is very useful in e.g. web-based feed reader (provides the original view of the site without having to go out of the reader and into a new tab).