Really well-structured piece, and worth pointing out from an SEO angle: the way you've broken this into numbered sections with a clear TOC is exactly what tends to earn featured snippets and "jump to section" rich results on Google for technical queries like "typescript generics vs interfaces." Long-form technical docs that skip structure like this usually rank for the title but miss out on ranking for the dozen sub-questions buried inside. Small thing, but it compounds a lot over time for tutorial content like this.