I know very little about eCash I have to admit. It seemed to arrive with a lot of dev fanfare and limited info for the average user. End result was me largely ignoring it and focusing on stacking sats.
Discussion
eCash is great for certain use case. Keychat for example couldn't work without it.
I’m bullish on eCash for retail transactions.
Why is that?
Because bitcoin on Lightning Network, as the name sugests moves fast, like a Lightning. So you can pay instantly to anyone, like zapping on nostr.
No need to worry — you can pay with sats, zaps, or ecash. In the end, it's (more or less) the same thing: Bitcoin on the Lightning Network. That's why it's usable in retail.