the cryptocurrency is not only extremely expensive in terms of its mining costs, but also inefficient in its long-run design.
Mining cost you say, remember when it would cost you nothing to mine bitcoin? Now it costs so much, what does that tell you, that's indeed growth, development, improvement, it shows you it's no longer some valueless shitcoin you simply mine with your ordinary computer.
Bitcoin is more than efficient in the long run, if you trace it's growth from 2009 till now, you may then want to edit that part of your post.