It's not obvious, but adding touchpad gesture support to X will benefit you too even if you're not using X.
This will make our work of convincing the maintainers of other open source projects much easier. X and Wayland cover essentially al Linux users, so we will not need to estimate how many users will benefit from implementing gesture support in toolkit X or application Y.
This is really important, because maintainers of open source projects don't usually care about suggested features if they're not interested in them themselves. A new feature means additional work to them - discussing the design, reviewing PRs and handling of eventual bugs. Often the person who implements a feature disappears after the PR is merged. This makes the maintainers to view all feature proposals with a grain of salt. We need to have a convincing story of how majority end users would benefit in order to make the contributions easier.