Components like text need additional guidelines like baseline to be used effectively. TeX equation layout also requires guidelines. Custom images, too, often have natural guidelines that need to be used sometimes.
This is a pretty standard part of declarative UI frameworks, and we could probably just copy their approach.
On the other hand, alignment guides could just be seen as another custom interface (see above)
Components like text need additional guidelines like
baseline
to be used effectively. TeX equation layout also requires guidelines. Custom images, too, often have natural guidelines that need to be used sometimes. This is a pretty standard part of declarative UI frameworks, and we could probably just copy their approach. On the other hand, alignment guides could just be seen as another custom interface (see above)