I dunno, I just find their segmentation weird for it to be just time passing. I mean if that was the case, it would just be there instead of the way its presented.
And even if they weren't, the era's of prosperity, chaos, and perhaps even the golden era could provide us with games. The timeline isn't shoehorned as much as you think it might be imo, the only reason why they had to go with a 3rd timeline is cause there would honestly be no way to fit them in the other 2. FS and FSA though are hilarious.