Thanks for the confirmation in regards to the power inserter and broadband box. He (the installer) breifly went over that all with me and I was just going off memory.
The reason why the splitter is outsite for now is because when we built, the builder installed 4 free LV lines for us. We used 3 for coax and 1 for cat5e. I did a lot of cable running myself for multiple A/V reasons, one of which was I wanted a structured panel. All I did was run the wiring and had no ends or gang boxes completed as all the builder allowed me to do was run the wiring until we moved in. I had directv and comcast at my door the day after closing to get us up and running .
So they used the builders wiring to do a general hook-up using a demarc box to get us up until I was reasdy to complete the wiring. I had the directv guy just put the splitter in the box to stay out of the weather unti my honey-do list was shortened and I could do some things I wanted lol.
So essentially, I will just keep the demarc box on the house to keep everything from the weather and just have a barrel connection from the dish to my panel and then a coax going from comcast's setup to my panel for internet. I will be running a few more coax and a few cat5e lines to the demarc box for future proofing.
Also in regards to signal loss, I will only have a barrel connection in the demarc box and then the main 8-way splitter at the panel that directv supplied. For coax, I used Belden 7916A line throughout the whole house (except for the line that the builder provided). And maybe down the road we may go over 5 receivers, but right now we only have 2.