You dont own those either. If you lose your copy, it's gone forever with no remediation or claim of ownership except at the specific retailer you did your transaction at. The source where it came from is unaffected by your loss, and they can decide at any time to stop selling their discs with or without your involvement. The nostalgic rose tinted pandering behind vinyls and old media conveniently forgets the introduction of digital storage to actually ensure reliable redundancy, and so "buying" physical media is just a smoke and mirrors way of saying the disc is for vain aesthetics while the actual mental relief comes from the secondary process being able to digitize it locally.

Following the same mindset of circumventing the traditional process, I could spend one single month ripping every single song I possibly can from Spotify and have the same claim of ownership over their files that you do with a much larger variety and without all the wasted physical space on assets that are immediately digitized. The only benefit to your method is that you feel like it justifies hoarding.