It's the reality of storage pricing. The general statement "storage is cheap" is incorrect. For some practically relevant purposes, such as Apple laptops, it's $600/TB. For other purposes, it's significantly below $50/TB.

You could say "just don't buy Apple products". And sure, that might be a solution for some. But the question of what laptop to buy is an extremely complicated one, where storage pricing is just one of many, many, many different factors. I personally have landed on Apple laptops, for a whole host of reasons which have nothing to do with storage. That means that if I have to bump my storage from 1TB to 2TB, it directly costs me $600.