Pre-releases are not a new thing in K-pop, but they have become increasingly popular since last year, with almost all groups, especially the popular ones, adopting this approach. Personally, I dislike it. Why not just drop all the songs at once, like usual especially if it more than 2 songs? I feel it kills the excitement, and most people don't even care about it, especially if the pre-released songs are not well-received. The most important thing is that it confuses people.
As for multiple music videos, I actually like them. It feels like more songs are being promoted, and some songs may unexpectedly explode in popularity. However, I don't think it's necessary either, as I'm afraid the cost will be taken from the groups' profits later or added to their debt.
