"so a full or custom scan shouldn't be necessary" - shouldn't, but I had a unique situation were I wanted to do a 'one time' exhaustive scan, not a daily exhaustive scan.
I have Malwarebytes Premium 4.3.0 - is there a better version than that?
I have a problem where after a day or so, my Windows O/S start chewing up CPU cycles, and the operating system is writing an insane amount of data to my SSD C: drive. I can think of no good reason for this persistent behavior. Before troubleshooting further, I want to rule out that there is not some sort of malware in the O/S causing this very weird behavior. So, one-time only, I want to run the most intensive malware hunt possible before exploring other problems.
The current design of the UI makes this all very frustrating and unsatisfying.