it's because Aza is a dumbass and doesn't link shit.
"With Gears 5, The Coalition took the criticism Gears of War 4 had received for playing things a bit too safe to heart, and changed things up noticeably in quite a lot of ways. Though at its core, it was still a classic Gears experience, changes to its world design, lite-RPG mechanics in terms of progression, and more options presented to players in how they wanted to tackle combat scenarios made for an experience that felt fresh and exciting, and one that successfully invigorated the franchise. And The Coalition only plan on taking those things even further in future instalments. Campaign design director Matt Searcy recently told GamingBolt in an interview that the open world sections, more open-ended combat, stealth sections, and the progression mechanics involving Jack are all things that The Coalition did in Gears 5 as a way to lay down a foundation for the future. According to Searcy, future instalments in the series are going to continue building on those foundations."