The only disadvantage I may see to this is that it skews your counter of daily cards. So you may feel discouraged if you see that you have a large amount of cards to review and that it will probably take you a lot of time to go through them all, while in fact, you will only spend a few seconds on those that you already remember. Unfortunately, there are times when I cannot for the life of me do my flashcards because there are too many of them to review, and I either skip that day's session because a) I tell myself I don't have enough time (which is a lie most of the time!) or b) I don't have the mental energy to go through them. The only (partial) solution I have found to that is doing them first thing in the morning by trying to plan my schedule accordingly and wake up a tad earlier.