I personally think it's because in many ways we're not building native, snappy, keyboard-driven desktop apps any longer.

Everything is moving to the web or web-like. Most of the apps I use at work are web-based and mouse-heavy. The overall slowness and latency of the UI is killing me.

TUI apps represent a weird niche. People building them are _usually_ into providing a UX that is fast, productive, offline-first and composable (ie: lends itself to automation). It's a breath of fresh air.