F5 doesn't ask what your data is. It asks what properties it has.
You pick a cell type (e.g., VTK_TETRA). If your physics requires a new element type, you must wait for a format version bump or hack an extension.
You describe the Skeleton and Representation. A triangular surface is automatically a point cloud and a refinement hierarchy, expressible in any coordinate system.
F5 datasets from 1999 are valid today without modification. This requires thinking about your data mathematically from day one. It is a one-time cost that pays forward indefinitely.