The Last 1%
None of those things are going to make a bad feature successful and not doing these will not make a good feature unsuccessful. They're all a form of technical debt that should be used very sparingly. Some of them will be more of a distraction than they're worth.Somewhere around 2010 a sort of product development pseudo-science started to take hold of the industry. Telemetry, A/B testing, surveys... oceans began to be boiled to avoid the uncomfortable fact that good product is developed intuitively by good product people. This "last 1%" is somewhat akin to waterfall development.Stay lightweight, hire people proven to design and ship awesome product and iterate as fast as possible. Use your own product. Talk to people who use your product. Take chances with your product design. Don't let organizational turf wars shape the product (something telemetry driven development is notorious for). Good old fashioned craftsmanship and creativity can go a long way. It's how new industries are born.