Truly, two things drive me to care about having this kind of personal media library, which is absolutely not worth it otherwise on a cost basis alone, let alone the time it takes:
1) Works that are only available via piracy, of which there are a handful of entries I'd hate to give up, and
2) Inability to create curated cross-service playlists for my kids, and lock them down to only watching items on those playlists. Only way to get this is by keeping your own digital copies of everything you want on those lists, or by using only physical media, which takes up more space and is prone to being broken or lost (especially when handled by kids)
Parent here as well. I see so often people or unfortunately the grandparents just using youtube for a child song to play. I am very happy with my children playlists and avoiding the kids beeing expose to ads and unlimited consumption/ endless scrolling modes.
1) Works that are only available via piracy, of which there are a handful of entries I'd hate to give up, and
2) Inability to create curated cross-service playlists for my kids, and lock them down to only watching items on those playlists. Only way to get this is by keeping your own digital copies of everything you want on those lists, or by using only physical media, which takes up more space and is prone to being broken or lost (especially when handled by kids)