A crash at the macOS Notes client generates log files. Crash happens, log files are helpfull to fix the issue.
Beside the IBM_TECHNICAL_SUPPORT folder have a look at: .../HCL(or IBM) Notes Data/Expeditor/Applications/logs
(You might know, this Notes data path is hidden by default under /Users/[username]/Library/Application Support/)
We noticed a ticking time bomb there.
Every crash generates a large .dmp file and additional log data. This path is for the Java log files. The .dmp file correspond to the used memory during the crash. On a 8 GB RAM machine it grows to 10 GB .dmp file at ANY serious crash! This .dmp files also never get deleted. And they are hidden and can not be cleaned up easily buy a normal user.
As we all know, Apple sells often machines with much RAM and expensive ,as result, low disk capacities.
As result, macOS users with frequently crashes ran out of disc space sooner or later.
I suggest to take memory dumps not per default, only by a special 'debug' flag in some config file.