Facilitating asynchronous payments is needed, and to the extent that ecash achieves that, and improves privacy, I see benefit. Cashu in particular is built on Lightning, and so in order for payments to as cheap and fast as possible users need to be on the same mint. If I send you a payment and I’m sending from one mint and you’re receiving on a different mint, then there is a regular lightning transaction involved in the transfer from my mint to yours. So there is still a centralizing effect in that it’s more efficient to have users on the same mint. But it’s perhaps no more centralizing than current custodial lighting providers, which is why my meme above says what it says. For purposes of zaps, it’s just custodial lightning with more steps involved.