Apple did not "disable" Cut.

1. Copy the source file with Cmd-C

2. Browse to the destination

3. Move with Cmd-Opt-V

It's a UI design decision to avoid Cut in the filesystem. Cut would behave differently from Cut in every other app -- namely, the file is not deleted immediately after Cut. It seems better to avoid calling this "Cut" than to have it behave inconsistently from other apps.