From the perspective of the devs (or whomever) I get the intent is it's trying to indicate this is a "new beginning" for the IP, but yeah it can be annoyingly confusing at times. I know Battlefield 1's reasoning is the "1" really referred to the fact the game is set during World War 1, but that's like the one exception. For Xbox it was deemed weird their eighth gen console was called "Xbox One" with the reasoning being they wanted the console to be seen as an "all-in-one entertainment device" (the reason launch models came with Kinect was because they wanted people to use it more as a hands-free remote than anything), so now most everyone just started calling the original Xbox from 2001 "Xbox OG."