I have a lot of Japanese friends and travel between Japan and here frequently. TikTok is huge in Japan and a lot of my For You Page is content trending in Japanese spheres. I don't live in Japan so being able to plug into Japanese media is a very, very convenient thing.
I'll probably continue trying to use the app if possible since I mostly connect with Japanese content, but I will say there's also a fun world of Japanese creators who straddle the English and Japanese speaking words who are about to lose an outlet to the English speaking world, and I feel really bad for that too.
The "algorithm" is also just so much better than Reels and others. I spent an afternoon of PTO training my algorithm a couple years ago and it's been great ever since. My partner and I share TikToks with each other all the time and. we shape each other's algorithm and interests. Reels fixates too much on your follows and Youtube Shorts is honestly a garbage experience. Both platforms really reward creators building "brands" around their content rather than just being authentic or silly. I treat Reels as the place for polished creators or local businesses who are trying to sell me something and TikTok as the place for content. I find that I get a lot less ragebait surfaced to me than I do on other platforms, though I admit my partner gets more than I do. We both skip those videos quickly and that has helped keep this stuff off our FYP.
An important thing to remember is TikTok was one of the first platforms that was opt-in for short-form content. Both Reels and Shorts was foisted upon users who had different expectations of the network and as such had to deal with the impedance mismatch of the existing network and users who didn't want short-form content. TikTok's entire value proposition is short-form content.