Should I buy Blu-rays again instead of streaming everything?

Yes—but selectively, not as a full replacement for streaming. Buy Blu-rays/4K Blu-rays for movies and shows you truly want to keep, rewatch, or see in the best reliable quality. Keep streaming for casual viewing, discovery, and things you do not care about owning.

A good rule: if you would be annoyed if a title disappeared from a service, got edited, moved behind another subscription, or became unavailable, buy the disc. If you only want to watch it once, stream or rent it.

Blu-rays make the most sense if you care about ownership, consistent availability, bonus features, better bitrates than many streams, or collecting. Streaming still wins for convenience, breadth, travel, and avoiding storage clutter.