The real problem with abstractions it promotes the lowest common denominator. If you have lots of different storage options, an abstraction will try to abstract them and create a standardized interface.

But this is a trade-off. The real benefit comes in simplifying the programming model and not forcing developers to read through manuals figuring out how to flip a bit on a hard drive. Instead, they can leverage open-source and libraries that rely on that standardization to deliver most of the value (with a small perf hit)