He created BRKB for just this purpose. He doesn't need to split BRKA for any reason other than Nasdaq's computers
If not having power, that seems upsetting. But...thats how power works, otherwise it isn't powerful.
Shares, whether in one class or many, are packages of claims against the company, not really ownership of the company in the simple sense. That’s fairly fundamental to the corporate form as distinct from, say, partnerships.