> The speed of cryptographic function such as ciphers and hashes are quoted in cycles per byte.

That's called throughput, and denomination for it absolutely doesn't matter. You can measure it in megabytes as well as in MarketingMegabytes.

> If the CPU is 800 MiHz (never heard of that term, lol), then it processes 800 MiB in 1 second.

Plot twist, your 800MHz CPU oscillator would never run at 800,000,000Hz sharp for any substantial stretch of time. And clock specs are typically rounded numbers. That's why this whole example is ridiculous.

> No, I'm pointed out that the industry has already splintered into two.

No shit it did. My point is that it did it for no advantage at all. You could measure storage megabytes in same normal sane megabytes as before, just couldn't lie about it to the customers.

> If a byte is not derived from fundamental SI units, then it should not take on SI prefixes.

Kilo is a Greek prefix, not SI prefix. You can split hairs that it should mean sharp thosuand but it does not exist in terms of computer architecture. Kibi however is completely made up shit used by noone else and it sounds like a wannabe cartoon character.

> It is certainly feasible.

It is not feasible, that's why they aren't ever gonna be made.

> Also, if you have a computer and put in a 4 GiB stick of RAM and a 2 GiB stick, then you have 6 GiB of addressable memory, which is clearly not a power of 2.

It is not a power of 10 either, you should really think this through.