You’re missing the point. As digital exists, there is no supply issue. That’s solved. So there is no disc capacity or supply issue, as a result of that. Preordering is taking on their risk, not mitigating yours. Your risk of not purchasing is exceedingly low.

No, there is a finite amount, agreed. However, the cost of making and shipping is minimal in the overall production cost. If no they need 100, shipping 120 is easy. Any excess can be used for following weeks and months sales. The gamer doesn’t want to miss out, but the company is much more likely to take active steps to ensure they don’t miss out on a sale. In the age of digital, even if they did sell out, it can still be pirchaesed online. So, it is high risk, low reward to preorder.

So, while missing out on day one is possible, it’s extremely unlikely and so preordering is basically a free loan and handing over money before there is a chance to assess quality.