Evaluate an alternative for physical properties that reduces implicit requirements

[jacques-n]

Based on this slack thread there has been discussion about moving to a more explicit form of physical properties than the current, relatively implicit formulation. This could reduce behavior requirements for executors when they are not needed, reducing execution cost. Additionally, explicit properties would be easier for new users to understand/work with.

This task will be to evaluate alternatives and see if we can find something better than the current system.