I think you're confusing quantity as being the end result. The quantity is about experimentation. The quality comes as the winning products are refined over time; the low quality products never gain mass traction and are discarded. That's exactly how it should work. These things are complimentary, not mutually exclusive.

That process is how innovation happens quickly. It's also how you frequently discover new things you weren't looking for, which is how a lot of innovation happens (by accident). Rapid iteration is in nearly all cases vastly superior to turtle-speed iteration.