Motivating phase space realism:
Descriptions of systems in terms of energy and momentum more fundamental that spatiotemporal properties. (Amelino-Camelia especially.)
Analogy between relativity of simultaneity and relativity of locality. Latter explained by invariant phase space interval with observer-dependent slicing of phase space.
2 concerns with latter motivation: doesn’t tell us phase space absolute features more fundamental than decomposed bits; global vs local quantity distinction rather than absolute vs relative quantities.
At most uphold momentum space realism rather than phase space realism.