Or, more accurately, its easy to make UIs for it?
I'm personally bearish on the whole idea from a community / technical standpoint (in that I'd like us to return to more native stuff than follow JS into the browser), but I can't argue that WASM and co won't enable some really cool uses.
On top of that, JS devs would be the ones who get the short end of the stick, because js is the one language that does not compile to WASM because where WASM comes from, you already have a JS environment, no need to build a second one inside WASM.
My takeaway from WASI is that it would allow for a single universal runtime with near-native execution. The near-native aspect being what other universal runtimes like the JVM and CLR lack due to their bundling of a GC and other non-essential features.
Node always struck me as a strange trend but using web tech for UIs seems like a good fit for a lot of cases