So why doesn't someone just create a new Bitcoin and just fix those things?
not that easy. bitcoin was at the heart of all users. many coins are to be like bitcoin, there is even more sophisticated, but they can never compete with bitcoin,
Yes thats true as its the leader for the tech, others can just adopt it. I don't think much fault about bitcoin. It has got its existence and has been running long. The programming behind the technology feels to be difficult. One who have interest in writing codes its not a big deal. This can also be overcome by a a person if he has willingness to learn more about bitcoin