So, if I want convenient nightly backups (without plugging my phone in and using the "new" Catalina apps, which I'm still convinced are just new iTunes skins), Apple — and adversaries — will still have unfettered access to all my iMessages, Maps history, photos, health records, almost everything listed here and more [0][1].
Tim Cook has claimed a fix is coming for a while now [2], but meanwhile using iCloud for its intended purpose is a huge, and largely unadvertised, gaping hole in Apple's otherwise impressive privacy promises. :(
[0] https://www.theverge.com/2016/3/2/11144588/walt-mossberg-app...
[1] https://www.cellebrite.com/en/productupdates/move-your-inves...
[2] https://www.macrumors.com/2019/02/28/eff-user-encrypted-iclo...