The kind of coffee you drink can make a huge difference as well. Filter coffee is typically larger in volume so there’s more acidic liquids going in to trigger your heartburn. Compared to espresso which is usually a smaller volume. It can be a huge difference in heartburn between coffee types.
iCloud seems to work differently. Nearly all of the photos and videos I have are stored in iCloud because my phone is only a 64 GB device. But I can scroll back many years and pull up any photo video and play or view just fine right away. I can swipe right through long sequences of photos from five years ago on a device that doesn’t have them downloaded. I’m not sure exactly how that works.
The iCloud backup built into the iPhone for me seems quite seamless. As I mentioned in another comment, I have several thousand photos and videos that don’t fit on my phone because it’s only a 64 GB device. It’s been this way for many years. But I can still scroll back and see all the photos. And when I click one I view it instantly. I’ve never noticed any lag or any problems associated with the cloud backup. It feels to me exactly the same as if they were local.
First that’s not iCloud backup but iCloud Photo Library. Second, I’ve experienced data loss with exactly this feature. I stopped using it in 2021 after using it for six years from 2015.
I have a 64 GB iPhone and I’ve never come close to using all the storage space in many years. I’ve got thousands of photos and videos but like you say, they are automatically backed up to the cloud and then the local version is optimized away until I need it.
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