The biggest benefit is simplicity, the greatest drawback is lack of extensibility (optimizer, etc). Memory footprint is not really optimal, because T3X9 keeps

The biggest benefit is simplicity, the greatest drawback is lack of extensibility (optimizer, etc). Memory footprint is not really optimal, because T3X9 keeps both the entire source code and the entire executable in memory all the time. I wanted fast compilation, though. For small footprint, I would have made it a two-pass compiler. An early T3X compiler ran in tiny on DOS (64KB for code and data).