Every art form has processes and techniques. Not every process is named or enumerated. Many artists treat their original processes like trade secrets, or only make any effort to share them with their immediate circle of friends.

The "Why" described is that when the instrument is a single computer running a DAW, it has poor concurrency. You could change the instrument model instead to one that re-enables concurrency. You are doing the inverse presumably because you haven't had a good jam session before and only feel comfortable sitting behind the DAW. To get around this problem, you're rationalizing a process which is actually less efficient than jamming, as it straightjackets the creativity into a "waterfall" process instead of an "agile" one.