They rock. I've made a couple which act as proxies for previously web-only activities. e.g. a Github Issue manager app which generates a little kanban board for me locally. The barrier for entry feels much lower and doesn't have the same "spinning up a new next.js app" fatigue. And I echo your thoughts with design consistency, having it just inherit your terminal theme makes for a nice visual experience. My favourite in this new wave of tui apps is micasa.dev