Why should I install two connection servers?

Hi,

I have to install a very small View environment (about 10-20 Users).

Now I have installed one View Connection Server and connected it with one View Security Server (in DMZ) for remote access and everything works fine - connections from our LAN and out of the internet are possible per one single URL (Pin-Point-DNS).

So why should I install one Connection Server for local and one Connection Server in combination with a Security Server for remote access?

Ok, if we want to activate Two-Factor-Authentication then we have to do so, but apart from that?

Thanks for your help!