I strongly agree, and that's why I designed Pele to only follow its syntax not its layout. See the examples https://pele.run/examples
The playground also has a Compare mode https://pele.run/playground
Could you not make Pele part of Marmaid or they wont accept a contribution like this?
The layout quality is very impressive!
Have you given much thought to diffing diagrams? The source can be version controlled and a source diff can be seen, but a visual diff would be amazing and easily sway me from writing prose to writing diagrams.