SCCM 2012 R2 Secondary Site client assignment

Question

I have been doing some research and discovered that you shouldn't directly assign a boundary group to a secondary site. This confuses me a little bit and I was hoping someone can clear it up a bit.
Currently my client has a primary site (PS1) and a secondary site (SS1) in their environment. The reason for the secondary site is because there is a site with around 700 clients and that exceeded the comfort level of a distribution point. This site is located
in Valley Forge and we want all clients in this boundary group to use the secondary site. Everywhere else should use primary.
With that being said and after reading what I read, should I not directly assign the boundary group for Valley Forge to the secondary site? If not, how does the client know to use it? And better yet, what is the point of having the option to directly assign
to SS1 if it shouldn't be done?
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Answer 1

Jorgen, thank you for the link. This was the original post I read that rocked my world:) I just wanted to get more info on the subject and make sure it was still relevant.
MadLuka, much appreciate the explanation. Just when you think you know something somebody comes along and proves you wrong. Is there anything that I need to do for the VF clients to establish the understanding that they will need to use the SS like
assign it as a site system for content management? Even better should I include all site systems (PS and SS) within that content management so that they will use the PS when they roam outside of that boundary?
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