I agree that accepting it as a currency means early stakers get more money which is less than ideal. Same can be said about startups, the ones that are earliest in the building of company get most of the money. Most of the time, the founders and VC's are the ones that get most of the money with the other employees getting next to nothing.
This perspective is hyper focused on the US. There are countries (Venezuela, Lebanon) who's currencies have hyper inflated to the point where citizens have lost the wealth they've accumulated over their lifetimes. Cryptocurrencies allow them to sell their services/labour to a global market and to retain some of that wealth instead of having their local monthly wages be worth a fraction of the value that they earned.