I know it is also related to which platform it came out on, but I think the timing of Xenoblade Chronicles X was really poor, 2015 on the Wii U, when the system was already dead. Would have worked out better, had it come earlier. Then waiting a full decade before bringing it to the Switch mere months before the Switch 2 release, and without much fanfare. Given the scope of that game, I think the potential for sales was much bigger.
Of course same goes for Panzer Dragoon Saga, only ever being released on the Saturn in the last year of its support. That game could have been a massive hit.
I think also Alien: Isolation could have done even better had it been released now. The survival horror genre has really exploded in popularity in the past 6-8 years







