So many videos are just reaction videos, or doing trends which are the same concept (e.g. a dance, or challenge) just by different people. There's so much reptition, lots of creators that keep doing the same shtick because that's what gets them views. But it's so much worse than something like youtube where it's something that has to be condensed into a few seconds so it's all very superficial.
There's a significant amount of original content on TikTok, so I'm not sure what you've seen exactly, but you might want to scroll past those to see less of them.