Ethereum wasn't ever really intended to be a currency tmk. I remember attending a lecture by Vitalik at the local Bitcoin Decentral shop in Toronto shortly after it opened around 10 years ago. As I recall his vision for it even then was to be a decentralised application platform, specifically to get people to expand their view of blockchain tech as being more than just a replacement currency/security. That said, until it's cheap and fast/easy to use like you said, and one can have some reasonable confidence in the security of the contracts, it's mostly gonna remain a niche tool for blockchain fanboys and financial speculators looking to score a quick buck off market fluctuations and hype. At least until there're ubiquitous PoS systems that one can transact with it, such as to buy groceries or whatnot. I do think there's a lot of potential for it, the least of which is currency, but it'll need some time to grow and work out the practical issues you mentioned. My personal pain point on this is the KYC bullshit, and the fact that to get around that you pretty much need to accept being ass raped on the fees/price relative to it's market value.