Aloke from the Warp team here--you're totally right that some of these features (syntax highlighting) can be accomplished within the terminal using an editor. In a traditional terminal--you'd have to spend time configuring your shell to get this to work instead of getting these features by default.

Some of these features are near-impossible given the current terminal-shell abstraction, however. For example, a traditional terminal has no concept of command input/output, which means that it can't suggest a next command to run based on the output of the previous command.