I think the main point was to have a more interactivity friendly GC than otherwise possible. Having the user notice GC pauses on an interactive computer - a tab

I think the main point was to have a more interactivity friendly GC than otherwise possible. Having the user notice GC pauses on an interactive computer - a tablet - would have been a problem. MCL provided an ephemeral GC using the MMU of the 68020 (external) or 68030/40 (integrated). It dealt with short-lived objects in main memory, avoiding virtual memory activity. A similar level of responsiveness probably was the goal.