Not necessary. However, If you have enough time to focus, you may have a YouTube presence.
The advantage of having a YouTube presence as a blogger may assist you to reach a wider audience and drive traffic to your blog or website.
You can use your YouTube channel as part of your content repurposing strategy for blog posts.
Here's related information that might be useful to you - 19 Hard Blogging Secrets Every Beginner or Intermediate Blogger Needs To Be Aware Of.
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