RB does not use temp files for edits
That is not true. (not to be rude)
How RB handles these temp files at the end of a session may differ, but there are definitely temp files in use. Otherwise 'Undo' would not exist.
In Audio prefs area there is a specific location designated for these temp files. It's labeled Audio Temp Directory.
I always use a separate drive for this location simply because incoming audio gets stored there (temporarily) during recording. I think it's a big 'little thing' you can do to add stability and speed to RB.
This way recording 8 incoming tracks to a different drive than the one that's reading 24 outgoing (already saved) tracks is beneficial for obvious reasons (drive thrash for one).
Check that mentioned location during a session; you'll see the temp files.
When you save the project they get interlaced in the project and a backup of the original is created, and then they get cleaned up (usually), but temp files do exist during a recording/editing session in RB.