I'd like to see more single purpose Nostr clients. For instwnce: I love #amethyst's new gallery feature, but I'd like to see a "nostrgam"-style client that only lets you post images as top level notes and only shows images in the feed.

There are tons more "artificially limited" client ideas like that. Seekng a handful of those would really drive home the "you have one key and one data set for your whole networked social world but it unlocks many different styles of experience" (rather than a dozen microblog apps with subtly different UIs)