Well, they include cameras that can record 4K footage. This takes a considerable amount of space. They can’t justify 64GB in those circumstances and call it an acceptable customer experience.
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It is when you equate the amount of space used to capture 4K footage, store songs and pictures, apps, books, podcasts ....... it’s ridiculously tiny when memory is pennies on the dollar.
Well, Apple offers your choice of 64, 256 or 512GB, plus you can get / use iCloud storage to as high a level as you like. For many many people, the 64GB is sufficient for what they need and do with their iPhone. So they make THEIR DECISION to purchase the base phone because it does what they need it to do. If they find they need more memory, they will use iCloud or some other cloud based storage, download to their computer, or, realizing they actually needed more, will consider purchasing another or their next phone with more memory.
As for you, Please, YOU can take the responsibility of deciding what memory level you "need" and then decide on how many "pennies" you're going to spend for it. If you're doing the whole pro photographer / videographer bit and you want all onboard storage, then YOU need much more than the base, you need the 256 or 512GB and maybe even the iCloud storage at 1TB too. And Apple offers all of that.
If the issues of how much memory and how many pennies you're willing to spend collide, MAKE A DECISION and then act on it. I get you want Apple to offer 256GB in the base config along with the base price. But it isn't, and it won't be (because 256GB is probably WAY too much for most people) and Apple wants multiple price points for its products. Maybe you can find a telecom carrier who will offer a discount on the configuration you need, or you can trade in your current phone to cover the difference.
But, IMO, whining about Apple's price points and memory configurations just makes one sound cheap and entitled. It is what it is, and YOU get to choose what you want to do. Apple is not forcing you to do anything, including buying their products.