The best feature of alternative YT clients IMO is "multiple subscription lists". I have so many subscriptions, when using the official YouTube app or site the "subscriptions" feed is overwhelming, and I prefer not to use the algorithmically-generated "home" feed. Since YT has kind of become the de facto "place to upload videos on the Internet", video topics are broad enough to constitute multiple web sites, and I like to be able to filter channels by topic rather than having them all grouped together.
If you're opposed to using a separate app just for this, you can achieve something similar using an RSS reader and YT's official RSS feeds (which I'm surprised they still publish tbh).
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