From all the major flaws presented in Bitcoin one could say PoW is the major flaw of them all making the coin more centralized than even most people can't afford to keep up with other miners, these are day traders doing there thing again making profits on your losses, beware most say it's like gold it doesn't need to be fast but in reality it just isn't so secure.
What did I just read? are you sure what you say about bitcoins PoW is a major flaw? you've got to be kidding me. IIRC, there's the same post like this before. I just barely remember it when.