Even if Google had reasonable customer support, relying only on a cloud backup is unwise.
UX being what it is, my aunt just lost most of her iCloud photos because she thought she was cleaning up her laptop to donate, but iCloud synchronized all the deletes up to her account.
My father "clicked the wrong button" and lost his entire Picasa library a while back.
More copies are better.
https://www.imyfone.com/ios-data-recovery/how-to-recover-pho...
Pricing plans and other terms of service can (and will) abruptly change.
There is no guarantee that Google will even exist 20 years from now.
If we are talking about data that is to be handed down for generations, I certainly wouldn't trust Google as a solution. I do agree though that setting up self-hosted local/offsite backup, the kind described in the article, is out of reach for most users. Maybe redundant copies on every cloud storage provider will do the trick?