1. Many retail investors do not have the funds to buy a full share.
2. Anyone who makes a spreadsheet containing the share prices of largest companies has to make that column wide enough to accommodate 6 digit numbers.
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.
That is a feature, not a bug
This also leads to those dodgy partial share adverts targeting younger unexperienced investors which is not a good thing in the long run.