@Hari I think this alone said it all
fixing flarums mistakes using an extension is really unacceptable.
The Flarum Dev team have a somewhat bizarre view of what a core product should look like. Sure, I agree with it being lean to a degree, but any product like this should have the basics at least - with SEO and GDPR compatibility being available out of the box. Any forum product relies heavily on SEO for it be be recognised with content content being added, and if that isn’t done correctly, then you are heading into unchartered waters.
WordPress SEO is basic out of the box, but it’s at least functional to the point where you could actually use or without needing a plugin.