Its basically just realtime pubsub rpc over a dedicated relay. Its no worse than an http server and slightly more convenient because lightning nodes can subscribe to requests and respond in realtime.
Discussion
But it’s not because you don’t talk directly to the recipient and don’t know if it received your message without an ACK, and only if you also handwave away the “needs to be on the same relay” issue, which isn’t really a trivial problem without a lot of coordination around relay selection, or, more likely, a dedicated proxy run by the wallet vendor….. which you might as well just use directly with HTTP :)