Why would you shrink the team rather than become 20x more productive as a whole?

Users don't want changes that rapidly. There's not enough people on the product team to design 20x more features. 20x more features means 400x more cross-team coordination. There's only positive marginal ROI for maybe 1.5-2x even if development is very cheap.

Either way can work. It depends on what the rest of the business needs.