Since its inclusion is not trivial, otherwise every launch game should support eyetracking already, the tech seems to be rather useless, so far.
But I don't think removing the eyetracking would save a significant amount of money, so having it should be good even if it just saves let's say 10% of render power. Swapping the rather high end SSD for a regular SSD (especially around launch time its speed was premium and certainly priced accordingly) and double/increase the RAM instead would have saved them some money and not made a worse machine, just resulting in less marketing buzzwords.
Especially how porting plans seem now and how third parties work, that SSD is almost just an expensive nothing burger in the end. (compared to another regular SSD. Regular HDD is of course another level)