I'm not in the Rust community, but it seems like one could have their cake and eat it too, using OOP with DOD storage.
* Use a special allocator for objects which reserves a vector slot from your structure-of-arrays.
* Objects records are offsets instead of pointers
* Object definition includes getter/setters which index the columnar vectors
* Store fields declared 'columnar' in a value vector. This could even give flexibility to group columns for locality where needed, and allow ancillary data to be stored in a "leftover" struct.
Yes, generational arena allocations are very popular. The larger question is more about the application architecture. Like where does one handle user input? Where does rendering happen? Etc.
