Hi, @WyleECoyoteNZ to answer your question, the two cables to your lounge will come from a splitter in the ETP, hence when upgraded it would be reasonable that the splitter can be removed (or in the least the un required leg removed) and just a single run goes to the DOCSIS3.1 Technicolour modem to feed the broadband router, all other HFC coax cabling is redundant.
Cyril