So when/how does BTC become a global currency?
Are we saying that was never the goal? Are we saying that it was all a part of the plan to only be a store of value and that people will always use something else for daily transactions at scale?
Did not Bitcoin already a global currency? It can be used as payment for purchases in different countries. I believe network congestion and global adoption are related but different at the same time.
Am I just wading through religious zeal or is there a valid argument for how BTC is supposed to become a global currency used in everyday transactions globally in a self-custodial way?
Bitcoin will not reach that adoption level in future, never.
Now, there are
642,420 transactions last 24 hours that shows Bitcoin is used for daily transactions, globally. Difference is there are always opposite people in a same society or a planet, there are people who will use Bitcoin for transactions and there are people who don't use it.
You can imagine it like there are people who read paper books but others read e-books, same examples with cash and digital bank transfers or through e-wallets.
Technology is improving so is the Bitcoin scalability if the developer really is seeking out a true solution for the problem. Remember there is no permanent in this world but change, scalability for Bitcoin is just a script away. If developer find out and created a script that will make Bitcoin scale, then it can refute the statement of never reaching the adoption level because of what it is today. Remember before the e-wallets and international bank transfers, it was a tangible coins and papers which is very impossible to transact international transfer without peddlers physically moving in every part of the world. How many decades or century it takes for tangible things to become digital? Bitcoin is still in early years of development compared to the existing financial system so we can expect a lot more development in the future if developers keep on searching and researching improvements for Bitcoin specifically the scalability feature.