This second half of 2021 is where Gamepass starts going serious, on the last couple years MS has been putting some of their first party games like Flight Simulator, Grounded, Wasteland 3 etc which are fine but nothing really epic, it had Forza Horizon 4 day one but that was 3 years ago, and same with Gears of War 5 but that's it, also some nice third party games but almost all weren't day 1.
Now in 6 months we're getting two big AAA's like Forza horizon 5 and Halo, also back4blood day 1 which is huge, Psychonauts 2 and AOE 4 (this one on PC only until release on 2022 for Xbox) and some nice looking indies like 12 minutes or The ascent. All day 1 , and all in 6 months from now, imho on day 1 stuff, this half year will close to last 2-3 years together, and its not stoppiing after that, 2022 looking huge aswell, and these are supposed to be the last "mediocre" years of Xbox