I'd be happy to have a two-hour discussion just on all these different questions, so I won't try to answer them all in a few minutes. Technological efficiencies resolve problems over time, so we are seeing all these problems getting resolved. There are things that existed multiple years ago that are getting faster and better. Understanding consensus mechanisms matters, because they are based on what you are trying to secure on the blockchain. Proof of work matters if you are trying to secure billions of dollars of monetary value; proof of history is much faster if you are trying to create a competitor to Visa, for example.
Understanding these.... They are not all built the same, nor are they all trying to solve the same problem, but I always go back to the root answer. We are seeing an asymptotic evolution in the technology that is making all of these better, faster and more efficient. All these problems will be resolved within the next five years, if not sooner.