But will it matter? You have the chance to earn more or less in a week, but mostly its an average. Because it is more or less you wont lose anything in the long run. Of course you can earn less in the first week and more in the next week when the difficulty raised but it can be the opposite way too, so i dont see that this is a big problem.
It matters for someone. Consider your employer pays you either $200 or $300 this week depending on pure luck. Somebody would not take that risk(for ex. he has a loan to pay). Risk alleviating instruments cost real money.
No (responsible) company in the world guarantees dividends. They may try to always pay the same (or even an increasing) amount, but a guarantee - to me that would be a sign of management with their head in the clouds.
As investors and owners, we bear some risk. If we can average a few percent higher net profit, at the cost of a little bit higher week-to-week volatility, then as long as that volatility doesn't put at risk the company's ability to pay its bills as they come due, I say do it.