I notice a broad audience of streamers on Twitter and I have a pretty good feed of entertaining content, where I'm genuinely moved to join in the conversation on posts. But I agree with some of what others said in response, that it may or may not really help your YouTube channel. For me, I already have some followers so any time I post about a video or live stream I'm doing, I do see that some people click and come over from Twitter (from the analytics). But I don't think I'd get much engagement if it was all I posted. On Twitter I make an effort to get to know the people I follow, and follow people whose work I actually really like, so I'm more likely to want to retweet them and whatnot. In terms of community, just like on any social media platform, it takes time to curate a good feed. But once you've got good stuff coming in and and good receptive audience that's interested in your content, Twitter is great in my opinion, and a good addition to having a YT channel. From a business perspective, but also for getting your videos circulating. Most platforms will favor native vids though, so you can consider uploading a short preview of your YT vid, onto Twitter, and link to the full vid on YT from there
Have fun, and best of success to you