Actually they were. The Interface Builder was sold also for the TI Lisp Machine - the TI MicroExplorer running in a Mac. Expertelligence developed the access to the Macintosh Toolbox for TI and also ported the Interface Builder to the MicroExplorer. Thus you could develop Mac-style user interfaces on the TI Microexplorer, including using the Interface Builder, which ran on the Lisp Machine and talked to the Mac for the UI display/interaction.
Here is a video which shows it running on a TI Micro Explorer, a Nubus Board in a Mac II.
