Hi, I posted a tiny rant about node-UI design considerations and how implicit layout constraints arise from node in/out placement here:
It’s not exclusive to the particle nodes UI but, especially since there has been some struggle adapting the existing node-interface to meet the needs of the particle system here, it seems worthwhile re-evaluate some fundamental design conceits (ie: node graphs are always to be laid out left->right) and common causes of graph messiness (ie: the switchback/shoelace effect )