Tiktok has been useful for several groups that are normally extremely supressed with other algorithmic social media. Tiktok isn't geared towards the "what will make you angry therefore keep scrolling" or "what will make you buy more things" motivations that facebook et. al. are geared towards, so it will actually show you things you care about. It also has a tendency to show you opposing viewpoints from time to time, which makes it surprisingly useful for deprogramming people from misinformation.

For people with specific medical disorders or conditions, tiktok was excellent for finding others and sharing information. For people of different minorities that are normally supressed on social media, it was excellent for building community.

So sure, if all you watch on it was dancing teenagers, that's what you are gonna get: Vine 2.0. If you curate your feed a little then it'd help you branch out from your interests without the primary goal of keeping your eyes peeled to it or grabbing more ad revenue.

if you are part of a group that tiktok was basically the only social media network that had ever been helpful for, it's a big deal that it's going away. Its not about the format of the videos, but the algorithm and its focus on your interests rather than making money.