The niche can be an advantage to get an audience. This is great to build a business, SEO traffic or monetize quickly.

However, if the primarily goal is to write a variety of interests, enjoy the creative process, or build a personal publication, a broader blog can be better.

It offers greater freedom and authenticity. Theses blogs existed long before SEO-driven emphasis. The readers often follow writers for their perspective and quality of writing. That's the difference with the mainstream content.