While I agree with you that Bitcoin has become a store of value more than a means of transaction. I must disagree with you that Bitcoin cash is a fast means of exchange see this post
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They can speed it up by increasing the block size again each time they do this more computing power is needed to process the transactions this costs more and involves some of the present processors dropping out. Eventually you no longer have a blockchain but instead have a centralised data base the very thing that blockchain is designed to replace. What is the use of just building a duplication of the existing system.
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(If you can substitute the word data base for what it is doing it is no longer a blockchain Andreas Antonopolus)
