There's often this taboo or stigma associated with acknowledging similarities in K-pop. Stans often want to think of their favorites as unique and one of a kind — visually, musically, and artistically.
That's understandable, of course, because they ARE unique and one of a kind. However, they're also human beings, so it's okay to acknowledge their humanness. They will be inspired by what's trendy in their industry and line of work, whether it's fashion, choreography, or sound. They will feed off each other's energy and creativity. And yes, this includes companies, producers, composers, songwriters, choreographers, makeup artists, hairstylists, and stylists. Art has always been collaborative even if indirectly so. The spirit of competition gives us this illusion that it's a constant battle to one-up each other, but in reality, that's not the case.
Example: In hip hop, flow and lyricism became much more complex and elevated through the years thanks to those who pioneered the genre and revolutionized it, introducing new techniques and styles. It would be oblivious and almost negligent to say today's great rappers weren't inspired by the legends who came before them. Even if it's not direct, the influence is still there.
This is not to undermine the individual's work. It's simply to acknowledge the nature of music — that it's inherently and continuously a work in progress. You may disagree, but that's a philosophical debate for a different time. I respect varying opinions.
Plagiarism is a different story, and I'm sure that's where all of us would agree to draw the line. Keep in mind, though, that it's very easy to subconsciously pick something up and accidentally passing it off as your own; the mind works in mysterious ways.
I say this not to be controversial or to get a hit thread, but to share my own perspective after experiencing culture shock when I found out how taboo it is to discuss similarities in K-pop. If anything, it's just to inspire solidarity regarding an issue that I see often.