Yes, I’ve noticed this too; older blog posts, forums, and niche docs I used to find via Google just don’t show up anymore. I now rely on site-specific searches (site:example.com), Reddit, and even DuckDuckGo for deeper results.
It feels like Google prioritizes fresh, SEO-optimized content and buries everything else. I don't think it's just storage. It might also involve cost-to-crawl ratio and directing users to commercial content. Long-tail web feels like it’s vanishing.