https://www.youtube.com/watch?v=mf5Uj4XIT1Y

Basically, preordering incentivizes companies to release games that are not finished. In general, companies will always maximize revenues while minimizing costs. If they can release a game that didn't cost them as much to produce (getting massive preorders through good marketing but pinching development and quality) then they absolutely will. look at any AAA released this year

It's literally pointless. You are getting no benefit. You can buy it when it releases.

I think one reason is that Bethesda's previous game's, Fallout 76's, release didn't go very smoothly. Not at all smoothly. Internet Historian has a good video about that: The Fall of 76

Why are people buying products that they can't even have until release day?