It seems like last year and this year, there were a lot more items that popped back into stock and on sale about a month after the sale. I don't remember it happening as much in prior years.
I don't know if it's that N's is doing a worse job predicting demand, that they're intentionally ordering more stock because they don't want to run out of things, or what. Part of it is that almost all items are available online now, and available to everyone not just N's card-holders, so all the pricing changes are visible to customers without much effort which is not the way it used to be.
I try to think about prices when I buy something and make sure I'm OK with them, no matter what, and try not to get het up when I find out I could have saved more. It is an investment of time, after all, which Angie mentioned in the other thread.
I do wish that N's would clarify their price adjustment policy and be consistent. They supposedly changed it so that they won't price adjust after 21 days unless the same item, color and size, is still available, but it sounds like others have gotten them to go back to their earlier, less stringent policy. IMO that's unfair.