Baseline for “modern” apps, what? We’re talking about a terminal application here, there is definitely, most-assuredly ways to write something that does exactly what Claude Code does with a teeny fraction of the resource requirements.

The trick is not bringing React into the terminal.

(FWIW, I have a link to a TUI harness in my profile that uses 50MB of ram and about 1% CPU while streaming, even in giant contexts)