This is as good of a time as any to tell you guys that future Oscar winning movie, Barbie, is now also available on Blu-Ray and DVD, physical copies that you'll always have if you want to watch it again.
Blu-Ray discs can carry mandatory software updates that change the functionality of playback devices, add “protections” against “piracy”, and could potentially revoke licenses of content on other discs.
Media companies are prepared to screw you over regardless of wether or not you but content from them. I do believe in paying for content, but I don’t trust any modern distribution to last, so I have a couple backups of all the media I’ve ever purchased. And for formats that make it difficult to back up, I sail the seven seas.
Hard disk drives will last even less. The lubrication will dry up and the disk will seize way before the 25 year mark.
Bluray is a fine back up media, I use them for stuff on my NAS that I cannot lose like precious pictures of family and friends. Not all of us live on am abandoned salt mine with perfect temperature and humidity for long term tape storage.