Because the OG Xbox was awesome and so was the Xbox 360, just because they had one bad generation doesn’t mean it’s the end of the world. The 360 era was kind of like the PS4 era where Xbox had most of the exclusive 3rd party deals and so on.
I’d argue the Xbox One wasn’t even all that bad, it was just the initial launch and year 1-2 in the aftermath of said launch that was bad, once Phil took over it started picking up again almost instantly. Other people here will have their opinions but this is mine as an Xbox player since the OG.
That said though, I’m an Online Multiplayer guy personally and Xbox has always been the home of online multiplayer games. People can mock Xbox for its lack of single player story games but I say the same for PlayStation’s lack of MP games in the first party department, 3rd party and the likes of CoD have heavily carried that burden for them for a long time.