the same reason one would file for patents without any intent of enforcing them. For defense and security.

I would say that to attempt to have zero growth/shrinkage is difficult in business. The market is always changing, people's preferences change, etc. If you try to stagnate you will likely find yourself shrinking, either because demand changes, or there are mixups in supply (competitors).

If shrinking is the only non-goal, then growth is likely the only prevention since stagnation is hard to ensure.