I've switched my personal site (riseos.com) over to Docusaurus from a Mirage unikernel for a few reasons. First, I was putting off writing blog posts because of the amount of yak shaving I was doing. Second, the dependency situation never really got to the point I felt it was worth the effort. And third, some projects I've been working on have pushed me to get a lot more familiar with frontend topics, especially static-sites that are rendered with React.
I've deployed a few sites with Gatsby, and was looking for something significantly simpler and more reliable. At the recommendation of the ReasonML team, I gave docusaurus a shot on another site, and it worked out nicely. I appreciate that it's limited enough to encourage you not to yak-shave too much (which is good from time to time, but not for my personal site at this time).