Preorders for next-gen console are already accepted, and those who want to get a new console among the first often use this mechanism. However, this year, many people may be left without a new device on the day of the start of sales, even if they placed a pre-order.
For example, Amazon has started sending out letters to users who have already pre-ordered a PlayStation 5 or Xbox Series X, with the message that these same users may end up not receiving the device ordered on the day of the start of sales. The reason for this is high demand. At the same time, Amazon notes that it tries to solve the problem, and the letter itself notifies of a possible delay, not mandatory.
However, if Amazon began sending such letters now, more than a month before the start of sales, probably, the situation is really serious. We can assume that the deficit of new consoles will not pass.