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

I was a fan, until I found in developing them, the same friction of a frontend developer. All of a sudden, I realized that the command line is already the TUI I want. Commands can be piped, while graphic interaction cannot. Now I rely on standard input and standard output, and `fzf` for all the rest.

i love k9s, it iss the best tui I've seen before the AI era(there are too many TUIs in the AI era, I can't keep up with them)