Well, if kind 1 doesn't make sense for some apps I don't see that as a problem at all and I am not trying to force those apps to use kind 1.
But many other use cases can have their own independent existence but also use kind 1 for signaling/discovery -- most notably the common "social" things like long-form events, video events, song events, podcast events, picture events, livestreaming events, calendar events, perhaps even nip29 group events.