By your "wireless" analogy I think you view these apps to be absurd impossibilities, like electronics without wires.
This distinction is important. SimCity 5 gratuitously required the user to be constantly online, talking to some server. I mean obviously - there has to be a server somewhere, right?
No, there does not!! We need to retain the ability to talk about apps that do not need ANY server, and "serverless" muddies that crucial distinction.
I generally just call them apps and people understand what I mean because of context. But if you want to get pedantic, Photoshop requires a computer (what a server is).
It's all useless and pointless.
"serverless" does not add any value. It causes confusion instead of creating clarity. It is utterly useless.
It was used a few times even on HN:
https://hn.algolia.com/?query=serverless&sort=byPopularity&p...
Which really means wireless networking doesn't exist, because there are still wires involved somewhere, and I don't hear people being pedantic about that.