There's a set of features in the README that you can view if you follow the link:

- Integrated SSH and Telnet client and connection manager

- Integrated serial terminal

- Theming and color schemes

- Fully configurable shortcuts and multi-chord shortcuts

- Split panes

- Remembers your tabs

- PowerShell (and PS Core), WSL, Git-Bash, Cygwin, MSYS2, Cmder and CMD support

- Direct file transfer from/to SSH sessions via Zmodem

- Full Unicode support including double-width characters

- Doesn't choke on fast-flowing outputs

- Proper shell experience on Windows including tab completion (via Clink)

- Integrated encrypted container for SSH secrets and configuration

- SSH, SFTP and Telnet client available as a web app (also self-hosted).

> Integrated SSH and Telnet client and connection manager

Honestly, ssh re-implemented "open source" in javascript goes beyond anti-feature and back around into "useful for security research".

- extra slowness