I migrated my site from WordPress to Gatsby around a month ago due to performance issues.
I haven't encountered any significant limits in using Gatsby so far, since my site is primarily used for blogging only.
Rather than limitations, I discovered how to use GraphQL to query my content and serve them with React.
Graphql is something I've been wanting to learn for some time now but haven't had the time/actionable project to work on, on a second thought, I did hover over it a couple of years ago, I think I decided to wait until it became more mature.
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