I tend to move with the job and my rented apartments look like a monastic cell. This in no way makes me more productive.

It's not about possessions, it's about how much uninterrupted focus you have.

With the 9 to 5 + commute treadmill, you are not going to be making a lot of progress on anything.

Getting rid of crap is easy. Finding vast amounts of uninterrupted focus is not. Checking out for a year costs $.